Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fc0affed9ee1b6…

MALICIOUS

PDF

78.9 KB Created: 2020-12-31 02:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 542a087c781d4b0eeb73365b2f63721d SHA-1: 1333d52f977918250414a464f4eefa9a9b575a43 SHA-256: 75fc0affed9ee1b62d3713cf9660b118b5b88a089c3e519bef5ed7e688d0c1e0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafffi.ru/strik?utm_term=singer+johnny+nash+wife PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fec102a6c410.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/1301376.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/fagumesodubugiledame.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/d0jjghV/46900381003.pdfIn PDF document text
    • https://pamemigewoguvo.weebly.com/uploads/1/3/4/4/134438925/natuwobaralutux-sotojupunox-fibagezawobew-surerew.pdfIn PDF document text
    • https://kozipizifepawu.weebly.com/uploads/1/3/4/6/134631686/jefipidajo.pdfIn PDF document text
    • https://cdn.sqhk.co/mifebemige/dlAtjf2/zajevukizepukodafeloz.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/xihjdaI/freeway_closures_southern_california.pdfIn PDF document text
    • https://cdn.sqhk.co/guletema/phfjdhn/steel_and_flesh_2_pc_indir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5fbbb284dac9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7125169-9e3a-4e45-9e9e-e3d516ffbd2c/babubapotojiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/android_8_for_samsung_s6_edge_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6ba2e4-dd14-4548-b6c2-6045b7922847/tavanemelosakeve.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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 5368 bytes
SHA-256: 4c63980b742c59db8dc918a3bbbd1b0262acef011320ef0792a619bdb80c20c1
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 11660 bytes
SHA-256: 5b9b3b68494a3f67569b43c01beb2f6a17dc004d0e28c244ef116ec5aa65f77e