Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2722081f1e9ba5…

MALICIOUS

PDF

86.8 KB Created: 2021-01-17 03:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 308a8c875f0fcda4b92fabdb4d1b2e2c SHA-1: d13e02ec3767b22391b70f699422d2117ce4d941 SHA-256: 7c2722081f1e9ba5bf345924d5068b8c47a2567776abcffbce59d0bc764c8c3f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to link farms and redirectors, with one specifically identified as malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=bojack+horseman+scripts In PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/daac72947e.pdfIn PDF document text
    • https://zuzunoginulori.weebly.com/uploads/1/3/4/7/134764202/6431425.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/jiKjgRU/super_snakes_centipedes_millipedes_attacks.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/eicgLxV/metal_shredder_machine_price_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/fygcasU/horizon_drive_fairfield_ca.pdfIn PDF document text
    • https://webupusew.weebly.com/uploads/1/3/5/3/135344455/21954592a12f43.pdfIn PDF document text
    • https://zomujowedava.weebly.com/uploads/1/3/4/6/134629266/45168.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/jjbyibK/lotimotijo.pdfIn PDF document text
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/mabigeritotadesezo.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/ajdhf1B/knife_money_clip.pdfIn PDF document text
    • https://jadikabejoza.weebly.com/uploads/1/3/2/7/132740193/1aac66e94ea.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/tamovagag/31639574567.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/pics_gmp_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/bartow_middle_school_uniform.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_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 5328 bytes
SHA-256: 766623ab2ca27b05e468fd6e0f244a079c2606fe37d7b3e157860941019b48a1
font_01_sfnt_off00012953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 10932 bytes
SHA-256: 3219fbd1130122bd6324c01fd506551e026e4aa42449e789bf19f456a9450370

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