Malicious PDF — malware analysis report

Static analysis result for SHA-256 975ae04c9cc719bb…

MALICIOUS

PDF

78.4 KB Created: 2021-02-24 12:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1174fad3de5af7ec2ab672f28fcef85f SHA-1: cdfce0ff75ee559c33640385184c5252b12d9590 SHA-256: 975ae04c9cc719bb3cb42d12999a3b3b932903f804ea18bb12e5192e304a607c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with heuristics identifying it as a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to service costs, likely to direct users to malicious sites for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=how%20much%20does%20it%20cost%20to%20service%20a%20lawn%20mower%20uk PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/MJn3ijr/legendary_dragons_of_atlantis_deck.pdfIn PDF document text
    • http://legionmone.xyz/fundamentos_de_enfermagem_potterggliy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fdc910e3df08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_601bbfc9ab6b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378167/normal_5ff5cbbc1b7bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_60186956699dc.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/iflEdpA/12925373375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1ba485cab9.pdfIn PDF document text
    • http://vashmaster.info/mazidimuvodipanaki7kili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_602ddf52abbb0.pdfIn PDF document text
    • http://copyright-supporthelp.com/how_to_clean_dr_browns_deluxe_bottle_sterilizernzaxf.pdfIn PDF document text
    • http://naturalgood.space/pythagoras_theorem_historyg9rom.pdfIn PDF document text
    • http://sportplays.ru/beats_solo_1_bluetooth_adapter0046r.pdfIn PDF document text
    • http://wordsideget.top/mastering_javascript_object-oriented_programming_download1bi63.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/1s3YEgj/hornblower_san_diego_sunset_cruise.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/gZkfNib/80399867238.pdfIn PDF document text
    • http://heartcenteredequestrian.com/kokizegi46a4s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 5356 bytes
SHA-256: ac3eef17dd9e5c4de98ce41b438ede3f9bf315ae0c4704f4eb04c234a2ed0f45
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 11052 bytes
SHA-256: ab0021adce3497cae12c7412b14e23c8a613b8b7e46e763ad0d38c4290ae7132

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