Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d36b31ff2eb7df2…

MALICIOUS

PDF

93.0 KB Created: 2021-04-28 01:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f4378094b8d7b510650713f9d84297c2 SHA-1: c9e6cef273fcfd97dbf01dc38d3d7cf8628824bf SHA-256: 1d36b31ff2eb7df28bb6a5368646a64ce4eeae66131e2eae3e540151e23b9886
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. While no scripts were explicitly extracted, the structure and numerous outbound links suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=adding+fractions+with+like+denominators+calculator In PDF document text
    • http://pililiriniru.mypressonline.com/10268880048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6026af69844d8.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/purobewexore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_6017215d2c569.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/772541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fcf42b27feac.pdfIn PDF document text
    • https://supeneti.weebly.com/uploads/1/3/2/8/132815050/04e3f07219578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470681/normal_6011efb7bfcbd.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/jifirerosudoke.pdfIn PDF document text
    • https://sepuzemafunud.weebly.com/uploads/1/3/4/5/134584668/c9f763a94.pdfIn PDF document text
    • https://vatatolomaz.weebly.com/uploads/1/3/4/4/134495066/divuduzulidoluneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_600ebc4707a00.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/19897847687.pdfIn PDF document text
    • http://ruvikuvi.mywebcommunity.org/russian_orthodox_bible_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b71bb8-db96-42a3-887f-b696bd9bcc7f/numerical_analysis_10th_edition_download.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/riwefatubexupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc645ddd-9d49-4b96-9d39-ede58371a7fa/88310085832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cb7952-a7ec-40e0-81c6-891cc9dc8d8d/how_much_do_lopi_gas_stoves_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc6d8a6-930d-4d8f-9651-016edbfa59f9/dell_b2375dnf_mono_multifunction_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cb116e-6095-4a54-9b62-2d14ec25ea71/danun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ec95a7-9e17-43ae-90fc-dc60c23d71ed/wagerod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531e7ffa-37c4-4d87-b04e-208d0cd60bcf/jovesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5d6333-9694-46f5-baa7-3da58a43280a/what_is_the_grameen_bank_in_bangladesh_known_for.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 4812 bytes
SHA-256: 1f964638570701d88b797804f25b65798da390420591a7cc98d36eb9b32b7291
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 5580 bytes
SHA-256: 630b3d4c2fab17a80b3fd76584b8998a2c8c15af909f545191b0dd5d2aa49961
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 13604 bytes
SHA-256: c9c54e3c3e3c74da20491c5f8a67208193b516b124e986733119791b5a87c349
font_03_sfnt_off00014c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C37 17228 bytes
SHA-256: cf9dedad6587aa4365316a3c60016ec6d370652271a40db8d875a118d2429d26

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