Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5743bded1e7875…

MALICIOUS

PDF

91.5 KB Created: 2021-01-12 06:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 054d206f05f66172e38ea73f86b6920a SHA-1: b58a21c1c44a9e2de9cf19006acaa9a4ece08a63 SHA-256: 9d5743bded1e7875191a4e17ad8a089e1ca75ed067bce11f52cbdfd8234d8ca2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The presence of a known malicious redirector URL further supports the malicious intent.

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://traffking.ru/123?utm_term=ncaa+football+11+psp In PDF document text
    • https://cdn.sqhk.co/zexukobesu/jfFjgnx/piano_tiles_4_magic_tiles_go_2020_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/ghhjOjj/the_forest_survival_game_apk_download.pdfIn PDF document text
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/wenudadajali-nezep-kajufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fa2ac655d134.pdfIn PDF document text
    • https://cdn.sqhk.co/nanovinojon/Whd8jjg/test_virus_email_attachment.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/givubidokikuri-supuzenozikoko-rifapoxuxavisa-bozivexewimoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f87c0ab462d2.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/2089707.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/kanofobelosi.pdfIn PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/luzekanafixofu.pdfIn PDF document text
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/22064560dd6a68.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/4963288.pdfIn PDF document text
    • https://zixobidepupakog.weebly.com/uploads/1/3/4/5/134503699/nutewetaneguke.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/rotugadibe.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_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 5076 bytes
SHA-256: e1a1d735f2cb0fa5e42f15a444bd942f54885f252bf7af3b2c8e77328be6da75
font_01_sfnt_off00013e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 10196 bytes
SHA-256: 052c661d270d05145d0e44e4c77c3a9629671f8352b9ea451178743e92c426e3

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