Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a3d3b7229a1eec…

MALICIOUS

PDF

92.7 KB Created: 2021-06-10 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4e5f8215001953ed4cd80ed67df96689 SHA-1: 1cc483d73b8c67d46f813ce98877d066a5447a57 SHA-256: 35a3d3b7229a1eecb2cd4c87dc3e609df56ccfe528b0a0d6d0e0991f45aa1b0c
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 0.9997

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
  • 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://philabc.ru/pbw?utm_term=th13+anti+2+star+base PDF link annotation
    • https://vovopifibinurit.weebly.com/uploads/1/3/4/6/134654598/falikimor_tikalemawepatag_zatewirakodefi.pdfIn PDF document text
    • https://satiragekawojiw.weebly.com/uploads/1/3/2/7/132740750/7a9ee5a1d694.pdfIn PDF document text
    • https://borojiwanap.weebly.com/uploads/1/3/4/2/134235821/9ae39a.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/nakijafosuko.pdfIn PDF document text
    • https://xisovunegukizak.weebly.com/uploads/1/3/4/8/134868464/namalotiwuxowur-miwafofabig-zalofasulirutes-tisujise.pdfIn PDF document text
    • https://posexabilibo.weebly.com/uploads/1/3/4/3/134350455/7209735.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/gilule_mexekevasex_fonuse.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/modijiwuzi-maximowatevo.pdfIn PDF document text
    • https://mojapilujo.weebly.com/uploads/1/3/0/9/130969316/vebebosi.pdfIn PDF document text
    • https://zofizefeva.weebly.com/uploads/1/3/1/6/131636954/9152550.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/mewaviwegubawe_gojuxuwudawe_loxifi.pdfIn PDF document text
    • https://pezumebudoko.weebly.com/uploads/1/3/4/6/134681460/f408fc.pdfIn PDF document text
    • https://roxoxurapu.weebly.com/uploads/1/3/4/3/134307884/lebop.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/29c88489-d786-4e0b-bdda-e6f7719d0aeb/arifureta_from_commonplace_to_worlds_strongest_light_novel_vol_1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979fb13a-f680-40ea-ae34-16fe13ae4b41/51150963661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8200745e-b73b-422c-b627-5223d9b494f7/how_much_does_a_2018_shelby_gt500_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660a900d-1034-4e4c-94ad-9a36e4798700/tl-wr841nd_v8_openwrt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82c770c-b052-4144-9294-9997b0627f4c/asus_z87_pro_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0fccaf-8236-4eb2-8538-ba349243584e/3rd_grade_math_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d095e99-6b92-4ce2-a769-4d5b4ea6a0fa/induction_program_report_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066ce4c8-94d7-49ca-a48d-3036fe36753a/zuxiradonunuvefaxiko.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_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 5180 bytes
SHA-256: 6134266fc41ea888574e308a535fc125ad430673f2d1a1559285075eac779c1f
font_01_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 10736 bytes
SHA-256: eea99ea1446f9e2a4790f0d3c7dafd544f73fb60f4e755a73c02cbb8f7bcdd3a