Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd08cbf799723c94…

MALICIOUS

PDF

84.8 KB Created: 2021-03-05 05:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 12a392b64d1f1bba30756931499f50de SHA-1: b66cf235ce74aa40e59fdfeb700648c90692531b SHA-256: bd08cbf799723c94498d73756dd4f09cb18cd78227a0a025de2c2b8eefe9f44e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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.
  • 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.
  • 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/123?utm_term=5th+edition+player%2527s+handbook+used PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5ff874bb827ee.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/geIpyEM/golden_dot_connect_legit_or_scam.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/22110b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_6038ea37abfc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_6014187800e8a.pdfIn PDF document text
    • https://bejudovadavaz.weebly.com/uploads/1/3/4/8/134898120/2322178.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/hbTZEh3/amazon_prime_tv_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fd3c244c0714.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/if6gdid/58116284286.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/ejjPQhj/cash_gift_to_family_member_tax_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/gAihgcK/zakatiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/ggFUwEK/bruh_dog_bubble_gum_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/dJ1Cbgg/f1_2018_playstation_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5fe0fe059b49e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_7b215f43124c48fcb9873aa888882862.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_c6498a3262b24717b614879eae87c311.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/topology_optimization_ansys_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/hallelujah_piano_sheet_music_for_beginners_free.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_ec6c33b0eaed4b7888f1c36e6f1cfbe3.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_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 5416 bytes
SHA-256: 3cdf8b37a459931c62ba55f394c64b2c7c9ed1e00a148ea97c41da2aa2f12787
font_01_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10440 bytes
SHA-256: 3ab56a698be0992d7a9c4119b0d5a261454d00eb13f599947a2e4e1cc6469642

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