Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a0087da979eef9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 19:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8ba1057de9d193da4ea71d0d5c8f51c6 SHA-1: 8c6755c12fcab9964f9058a092ee477e91c36b73 SHA-256: 39a0087da979eef95b0fd82fa235aa2da8520239f969570493099ada4c8f81e0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

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://dugedepap.ru/strik?utm_term=alesis+dm10+pro+review PDF link annotation
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/lasamurapesek-timabiwivezi-fowogegojovinu-labone.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jbakhfK/test_av_buddy_elsykkel.pdfIn PDF document text
    • https://cdn.sqhk.co/bidufewo/Cicgfjh/58322849419.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/942361fa11a2.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/hbiaGgf/82414344947.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/3090396.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ciglCge/72009945486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d64a498d98954238aa77addad2443b87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4773a0c-3737-4f02-8f18-54afab29e17b/51091899841.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_955c04ac1ea24fa19cd3fd26f1562c22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd54f10-1791-4988-8908-90ce0a6fa74a/nazekekagunav.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_fb52449d6e5b43869213742306efd0ca.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_6a6761f9ed8a4b7ea15dd366e943ee66.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_b567997bb8594ad5a27990266d909877.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_863abbacc8604c2da903e24e9351b640.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_b68995805d1341b4922ed982b4f8c7ca.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_e3df9bd3720b40f48653a000304323a8.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_361baa5d8a7344f99e8d1086fc041bb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b59580d-9442-4da5-aa6e-a1e6d7dec2d4/12731089089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf21c31-a95a-4425-ad55-013ae8daa3c0/82416412435.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_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 5232 bytes
SHA-256: 8020688106d8ab125bc8e63b851819a301358de90ab92a0089109ba2c6199028
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10868 bytes
SHA-256: d39cb4bf82ebe7e039271e1442aa2587f7f9c6ac8a6038791ec23edd6f09f118