Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d488b4677d1b74…

MALICIOUS

PDF

77.0 KB Created: 2021-02-26 02:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4470172ba4b2425ef01cfef44796dd74 SHA-1: dfa78c4430e396d619c86d0c79fd9b55aeb18ae5 SHA-256: 73d488b4677d1b74e5f750de1f09421e33d3ce10186ac3b5db3b230f9df2ea20
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=chapter+4+to+kill+a+mockingbird+vocabulary In PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/zizaditove.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/VFgiWjb/51796490409.pdfIn PDF document text
    • http://pezozolagipiv.22web.org/hankyu_hanshin_holdings_inc_annual_report.pdfIn PDF document text
    • http://aromaita.space/why_is_my_apple_wired_keyboard_not_workingb6mgg.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/ciek7hi/unblock_card_natwest.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/89217959.pdfIn PDF document text
    • http://liolika-rsya.ru/tesogodimapeferofofim8pz88.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/what_is_chemistry_like_in_high_school.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/zidez.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/golosa_book_1_5th_edition_answers.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/4949933.pdfIn PDF document text
    • https://cdn.sqhk.co/kajemuwasutu/ALAiijg/svrab_u_usima_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/jaDGlhe/imogen_heap_hide_and_seek_afrojack_remix.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5668 bytes
SHA-256: 1f701e7e50a35bff2aa4091c0d5db2fd05a969b51567590dfbcd796f4fe919e6
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10080 bytes
SHA-256: 900b75faf360dec381d23bbd9b927b009211b9c38c395273cd8278470513419f

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