Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8d4b231a0b91cc…

MALICIOUS

PDF

75.3 KB Created: 2021-01-23 10:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 17fb6441c3866b8849c2586360a8055c SHA-1: df204de7be237caa1551b547fcf84185f1060a6a SHA-256: bb8d4b231a0b91cc8136f51ed1eb43109dd7d9d17821508e9fdaca7fb19282d3
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of malicious intent, likely to redirect users to harmful sites or download further payloads.

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://jacksth.ru/aws?utm_term=baptist+faith+and+message+2000+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ff677d24179f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5ffe02627c8ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fdffe86c019c.pdfIn PDF document text
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/votuzejemu_navijumavuva_vejapevomiw_jamapewumemek.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/hojdDUp/flowers_stickers_for_whatsapp_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_6003ee162fd3e.pdfIn PDF document text
    • https://cdn.sqhk.co/xizowabik/aDDghhh/56295455178.pdfIn PDF document text
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/6150642.pdfIn PDF document text
    • https://site-1167973.mozfiles.com/files/1167973/atomic_structure_valence_electrons_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5fdef4005741d.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/Ijfhfhh/54122957635.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/jhB5y8x/47409155398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fce15e4c4c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fda88455ebc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fff0f61cc218.pdfIn PDF document text
    • https://gosesubamumu.weebly.com/uploads/1/3/5/3/135348433/karusefo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fde018e4e3bc.pdfIn PDF document text
    • https://botitanape.weebly.com/uploads/1/3/0/9/130969352/2196147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bewukikakew.epizy.com/8778728839.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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5752 bytes
SHA-256: 99408c612a9dbf594717c49e3c0449500b9ddf690b6359154d8352ef1f8a2a31
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10656 bytes
SHA-256: 0e0bbebb84a41d2a4d5036366d9a5f941a176c8f203da2c2105026ad81fa120a

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