Malicious PDF — malware analysis report

Static analysis result for SHA-256 629f385fbdecce70…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 22:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a4620ffbe5533c3f5309b50f478cb7d SHA-1: 758d6c074e034448ea075e344b11b697094928d0 SHA-256: 629f385fbdecce70e2471e6725bc8664d9a766a13b319d5b06fc6c901be63cbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a social engineering attack. The document contains a large number of external links, with one prominent URL pointing to a potentially malicious domain, suggesting it's part of a link farm or phishing campaign. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick the user into executing a command, possibly to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xezojetit.ru/123?utm_term=can%2527+t+be+erased+free
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/puxademuw.pdf
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ffe865b9510e.pdf
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/239ef58c6b4061.pdf
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603d1e062b788.pdf
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fd7b9762b4ea.pdf
    • https://folixesu.weebly.com/uploads/1/3/1/4/131453530/9484379.pdf
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6021d595eb8a1.pdf
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/2723774.pdf
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/sukawur-zafivano.pdf
    • https://static.s123-cdn-static.com/uploads/4451563/normal_6003e59aea691.pdf
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/3284968.pdf
    • https://static.s123-cdn-static.com/uploads/4493873/normal_6000823126697.pdf
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fcd5da12852e.pdf
    • https://cdn-cms.f-static.net/uploads/4445119/normal_6015adb1ea2e3.pdf
    • https://susudomi.weebly.com/uploads/1/3/5/3/135319884/8a2660f6c5136a.pdf
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/momufemezobitexi.pdf
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/robaragu-labepuzoledud-jevuxogiru-jipetef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mokuwanibof/safe_haven_security_salary.pdf
    • https://s3.amazonaws.com/kefodek/tulja_bhavani_temple_information_in_marathi.pdf
    • https://s3.amazonaws.com/jezekemunidup/guided_reading_level_bridge_to_terabithia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e362.bin
cba7ad76976885b53dc695384396522cbf212e0f0b39e775abe07b98d25b529f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 4948 bytes
font_01_sfnt_off0000f442.bin
fd73307ffb0efe8689bb5d8568b0a199b90b03789b71d3e2d759ece98e335f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10968 bytes