Malicious PDF — malware analysis report

Static analysis result for SHA-256 85355bde50829e0e…

MALICIOUS

PDF

95.5 KB Created: 2021-04-06 02:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1012f0dd58754cc8c1e929fd16e28228 SHA-1: ce5bbfe89416b128a96b1d907bd910a19f1672af SHA-256: 85355bde50829e0e05837d97e709dae122a6a5a1f57100116150811b76fbadaa
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/award?keyword=bretton+woods+conference+pdf PDF link annotation
    • http://dezlice.ru/gorillas_in_the_mist_summary_of_moviep2q4k.pdfIn PDF document text
    • http://masanakepatarar.iblogger.org/xisudinojixosekobegi.pdfIn PDF document text
    • http://chatik85939775.fun/6320470409903pds.pdfIn PDF document text
    • http://namixojebeku.iblogger.org/20220994499.pdfIn PDF document text
    • http://callup.today/4704819729558wyg.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/50e9130c-dd30-4ede-a455-768ed484b651/tamil_praise_and_worship_songs_lyrics_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffc19fb-c5f0-47e9-b8c4-0032fe63262d/autumn_blaze_maple_tree_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409c7751-2b82-40f7-9ca8-48b987241742/dd_3.5_stormwrack_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd218143-a56e-499e-8423-cd57d29ca055/22178004891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc9b4cc-aeed-4701-9b6c-ef88ef456d61/ludesetopamup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ee26c4-ea25-4b3f-a98a-2d2c8123b5c6/sapujekukisawoz.pdfIn PDF document text
    • http://mibesajaku.epizy.com/bepodufitagifenowapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9366078-5da8-492a-9452-e25751978db6/vejelafomi.pdfIn PDF document text
    • http://juwejaju.rf.gd/xovutikup.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_5045f2b83d0541c58c670bbf9a593752.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_e923b2c62c2f4e1397362e1614751e35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa161bf0-a041-41be-897d-b566600445a3/what_kind_of_oil_does_a_2011_lexus_es_350_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c159dfba-a1fe-4859-b1cf-122f3f8e954e/fipibopav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379c12e0-2c2a-4bd4-8950-db8fd92dec3e/27035367709.pdfIn PDF document text
    • http://keporeninudo.rf.gd/74497565614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc17ddc-9779-423e-a957-ff7ad4d88130/83424996165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cde6ed-fe2d-4072-be60-f0d023498f8f/3439610560.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 5048 bytes
SHA-256: c4450905e6f7d2175e2cbac4ab45d98f55b9454ee3f7fd55c75aa026f0fe8add
font_01_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 12092 bytes
SHA-256: 22d7e015af21c95627a605ff1de630d64c6e0cec2c6d925787fdcaff31fd3e44
font_02_sfnt_off00015aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA5 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e