Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac7c365b8fc548d…

MALICIOUS

PDF

72.0 KB Created: 2021-06-03 03:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 738b13baa2c8d3f6ad9b2b3a4926722b SHA-1: 5b4a3e49e132415183b8ab98c1fb79844073ba4b SHA-256: 1ac7c365b8fc548d2cbe0c1546f8561dad2002b109592d323da1b247a702f876
164 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 is flagged by a machine learning classifier and ClamAV as malicious. The presence of external URIs and the ML/ClamAV detections strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/pbw?utm_term=how+to+order+iv+iron+infusion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452626/normal_604aba1323706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_605627c981929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fceda97f17e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fd34f2cd82fa.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/c47622ab6b220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_604731dc23b01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5fedd641b02d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_6003515a1079f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_60009e253c2ad.pdfIn PDF document text
    • https://poburazaz.weebly.com/uploads/1/3/5/9/135993358/52d5462985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_60079084e65a7.pdfIn PDF document text
    • https://vozedebilonede.weebly.com/uploads/1/3/5/3/135333302/4235302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144529155/ruzuvufobepijizigek.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426687/how_to_install_far_mod_nier_automata.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144427506/amazon_blue_badge_conversion_2020.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/lazos_de_sangre_3.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/when_is_s9_plus_getting_android_10.pdfIn PDF document text
    • http://depowota.pbworks.com/f/salicylic_acid_safety_data_sheet_medisca.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144512586/kikudemaliweguvutam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 4772 bytes
SHA-256: 14d9e4c046b84d9377225e84dc117befbc859747b737827b03ee08819931100e
font_01_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 11004 bytes
SHA-256: 825a74bea25a19f32d135644328850070258b8c1846407c99fa1330f7af413e0

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