Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fc7f1c481a1c30…

MALICIOUS

PDF

76.8 KB Created: 2021-02-24 23:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 08d2c34a1d6869029f83ee36eed47dec SHA-1: 53e63ff782fb3b98f0fd29c68d299a5b6baf5e50 SHA-256: 48fc7f1c481a1c30e8649ad8c2f6fb2a09e2d44e73771b2bc77f408c5f906ea0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of multiple external URIs and the overall structure strongly indicate a malicious intent, likely to distribute further malware or engage in phishing activities.

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://bologen.ru/award?keyword=what+is+a+centrifugal+force+in+france PDF link annotation
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/baxelazebevur.pdfIn PDF document text
    • http://dream-stat.ru/464895665456zd7r.pdfIn PDF document text
    • http://chempion.coffee/bobcat_textron_zero_turn_mower_manualarocq.pdfIn PDF document text
    • http://shoplus.info/nika_dubrovsky_dreadlocksfa0ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fd99206eea8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_602ebbee35f37.pdfIn PDF document text
    • http://boldly-grow.com/3477405036wclxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_60143f38e205d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fdbc668914ae.pdfIn PDF document text
    • https://cdn.sqhk.co/firataxoworo/jdgfRgg/bowling_guide_botw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_600e5aeb46793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5feb447737f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461211/normal_60046a41682a7.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/jgh1jaf/kiwix_wikipedia_offline_file.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5feb6f3fa1898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5fe0b94b00f7f.pdfIn PDF document text
    • http://creditscorefix.info/animal_crossing_piano_sheet_music_easy1o2jr.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_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 5156 bytes
SHA-256: d5aa9dd920e6daf2cf224773c0ebd2e2c9575f0972b38ba80d4763424f3b6ac7
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10424 bytes
SHA-256: b8744d579bdc00034d25ad9920333cc2a70473eb07d661897d01ba735b380f73

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