Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a18c90f8b29b1c…

MALICIOUS

PDF

101.4 KB Created: 2021-03-30 00:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 92f4eb833fb5aa7251d2c56fa0170b9b SHA-1: 30fe68dc9a6a8e95323f8149cc9b19c6cbfefc91 SHA-256: e7a18c90f8b29b1c5af98c9fe37bf9f9f3ae0591d85f2b8a521d58e20bae9669
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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 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://yafferge.ru/123?utm_term=grammar+flip+answers In PDF document text
    • http://sanasojan.22web.org/54138373288.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/41753704507.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/popular_childrens_fairy_tales_list.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/90902550058.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/rukefezibatekim_lavanaduwu.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/9282234687.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/pasuwovog.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/matlab_2018_download_size.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/multiplication_with_regrouping_worksheets_grade_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e64fec6b-b30e-40fc-9c84-de2cab0c0b4f/what_to_eat_for_long_life.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_dbc904e34c8b43cd8c698538e5194d70.pdf?index=trueIn PDF document text
    • http://wiwazisumi.rf.gd/qaseeda_e_burda.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/34485032544.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/44690961045.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_b46b62d036b14722adf236d4d8db9642.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_f135728d96f64b9eb3df3c02c6e44c9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/267f29af-c3f1-4c7c-afb1-3d87fd88d112/nudukemu.pdfIn PDF document text
    • http://rebuvutiwedote.epizy.com/niwir.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/32118779499.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_8ac75a77504644d5868dd83f45182194.pdf?index=trueIn PDF document text
    • http://gelotamarabi.epizy.com/sistema_renina_angiotensina_aldosterona_veterinaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7443e319-09e3-40d5-b0b7-4c88405e6a43/what_is_meaning_of_howling_gale.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/mind_over_matter_lyrics.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 4768 bytes
SHA-256: 7d093a38c55037685b8b22aa8a287290c2543a609c40fc5fcd048a567ede91cf
font_01_sfnt_off00014d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0D 13788 bytes
SHA-256: 6bd6e76c6f8debca6bb1e7772c5eb4f6da659a4efedab64990c32423b3fc6b06
font_02_sfnt_off0001798a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176