Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6af0e99e3db07b…

MALICIOUS

PDF

76.7 KB Created: 2021-04-10 03:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d496b37ee77a7fe1cd27cf6643b710b7 SHA-1: df69ba7350ab519808a8e959e00c86d0473aa1cf SHA-256: fa6af0e99e3db07ba8c1f57595419b4e1f468c1d99549e2042f87ee279a53a07
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=calorie+counter+printable+food+calorie+chart+pdf PDF link annotation
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/mekujaxubimub.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/6a2986014.pdfIn PDF document text
    • https://nubokulusavabum.weebly.com/uploads/1/3/4/7/134702007/zumifetu.pdfIn PDF document text
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/1567700.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/56db9.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/5b741.pdfIn PDF document text
    • https://busajivajikiguv.weebly.com/uploads/1/3/1/3/131384407/popiluxumiv-kotokoma-sigerud-biwidesinuwijim.pdfIn PDF document text
    • https://jesokalatozu.weebly.com/uploads/1/3/4/5/134591365/ca40b5f02b969f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pufagaduvamoj.rf.gd/what_do_i_do_when_my_acer_laptop_says_preparing_automatic_repair.pdfIn PDF document text
    • http://mebuwakubir.rf.gd/36820794253.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_7cd2f90e22894f168a63c9d6ef0ee83a.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_5d2be886d78c4a58bbe7e6e65fabe17e.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_2bdcb80405574a34a0e2884bdf81aeb3.pdf?index=trueIn PDF document text
    • http://telefepoxuxoxis.rf.gd/spectrometer_principle.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_2ac47ff9629342e5b87481b29b95deca.pdf?index=trueIn PDF document text
    • http://lowojosixomab.rf.gd/fejefo.pdfIn PDF document text
    • http://xesujenomudot.epizy.com/appendicitis_diagnosis_guidelines.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_ebffc33688054a90bb5a239f219972b6.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5112 bytes
SHA-256: 415b3076259c37daa66e926a8d9f8458eea41ab426ff345669ad4f42a5e1dfbe
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10540 bytes
SHA-256: 97546b63a4ff4137618b4aacec9889ead9bde0c6659f23374c01b2cbe7a0310d

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