Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a10767277613fa…

MALICIOUS

PDF

82.3 KB Created: 2021-03-09 19:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a10ff9876f65dadf6e4300f706f77b0a SHA-1: 17eef2f7722bab22b7f2ff7d528190493d9e80ac SHA-256: 83a10767277613faa9f3a090ee6b6761e0bfb74b60cbb35dfe6b2eb8cf124e7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and one specific URL is highlighted as a potential lure. ClamAV detection and ML classification strongly indicate maliciousness. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to potentially malicious content, possibly for phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/wix?keyword=swtor+arsenal+merc PDF link annotation
    • https://cdn.sqhk.co/pinofizulag/ghfcLih/78293379417.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/KhdghGP/digfender_level_15.pdfIn PDF document text
    • http://hayatevesigar.online/what_to_do_if_you_want_to_be_a_midwifexs14b.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/sotagofelukeze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_601d2c92563f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5fea25aa18ed4.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/jghdsij/paladinz_champions_of_might.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/1Hcxhf9/627119554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_601689c375791.pdfIn PDF document text
    • http://ezfix.asia/lodutowalapisezim7bx2q.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/5828593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pubopelej/banjo_songs_at_320kbps_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/bgcse_biology_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/what_is_another_word_for_remove_errors.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_9e247624e9164da0bda33bdbb8ccbdd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/37941178320.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_8cd02cc26951417db16512eb8c565763.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_f2a9e68803344a3581d4e80da17c3dce.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_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 5140 bytes
SHA-256: aed7126c51f44fef0e29ca7f0ffc7d0de4807789a3aec5b425891b74ddc1e4be
font_01_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 13196 bytes
SHA-256: 2526789c6080aa384492f8e78dec58c01a1becea00b204ba40c4f1d474bc8923

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