Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5ba1ed78034767…

MALICIOUS

PDF

80.1 KB Created: 2021-01-13 08:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38ffb243e9b5ca9041588c2085f5eda8 SHA-1: eb2fd367b470c2fcb9057cc95a23154fbda7e738 SHA-256: fc5ba1ed780347673971aa190589b7ed8116fc3550eddef66bcf0a3fbc924033
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://trafftec.ru/123?utm_term=best+buy+alienware+desktop PDF link annotation
    • https://cdn.sqhk.co/junigofulum/hgijbid/tininisajovovid.pdfIn PDF document text
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/zekubenigunez.pdfIn PDF document text
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/45ede62c4a4cd.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/7595c8eb861dd39.pdfIn PDF document text
    • https://vimarunuwib.weebly.com/uploads/1/3/4/3/134356039/3f6012.pdfIn PDF document text
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/1ede56a569eb14.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/bd62eff7aa0f02.pdfIn PDF document text
    • https://site-1175739.mozfiles.com/files/1175739/red_watery_thing_on_dog.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/7413779.pdfIn PDF document text
    • https://site-1195159.mozfiles.com/files/1195159/air_techniques_scanx.pdfIn PDF document text
    • https://site-1168513.mozfiles.com/files/1168513/sibenuzikidakewip.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/hidDxia/lubedijetozexapuwokidojad.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/wifukedot/good_cheap_android_phones_2019.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_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 5400 bytes
SHA-256: 00072fba06264a1e40fdd705a65ca644314ee0447ec266476fad718b8701c15a
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 11524 bytes
SHA-256: 55d5f43f2c278210768bbcbbe21351d031df018bf2fb62a94e1fa80c00af02d5

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