Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2702fa638781354…

MALICIOUS

PDF

81.5 KB Created: 2021-06-14 20:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 149499d334583a36d6aa40f9bbf438fb SHA-1: 5563efb5cdce1505baa40650e6ce435b519c361e SHA-256: b2702fa638781354df0087e06b215a55244c665d98f31fa653083cf4a5e93a62
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 0.9995

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://pistant.ru/pbw?utm_term=among+us+crochet+plush+pattern+free PDF link annotation
    • https://vibupawovilopi.weebly.com/uploads/1/3/4/3/134377541/5783003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fe5bafc6c607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373999/normal_5ff0c765993a1.pdfIn PDF document text
    • https://xofisotojef.weebly.com/uploads/1/3/0/7/130739513/xapugevajawuki_selurajuluke.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/a2fa454ba9c958a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488141/normal_60b03017f2c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_602657748ebf6.pdfIn PDF document text
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/mazole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5fe63bf56ef8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_601be30da3442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_60190866f30e5.pdfIn PDF document text
    • https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/jofazenemepakesoxefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_601ad5294d597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_602a0facb630a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ad8a62a6-0369-454e-852d-85f49de2e46c/insecure_in_love.pdfIn PDF document text
    • http://dazokarodu.pbworks.com/f/29320743666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea242f28-1e83-4c97-ad4e-7a56e5daf627/how_to_clean_hp_7510_printhead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dc2392-0a81-40bc-946f-9dd238e7cae5/wusago.pdfIn PDF document text
    • http://natofuke.pbworks.com/w/file/fetch/144835944/earthquake_definition_causes_and_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f80534-39ca-4f1a-8835-211136d05e31/cisco_8742hdc_remote_sensor_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd9741a-049d-4916-9fa9-e185450f6eb2/fluval_306_external_filter_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5810168f-2e89-43fd-8fc3-bf172f233f66/zuratazivi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5252 bytes
SHA-256: 496fa9d8d902235b008fa273dfb0337ad29e1e2946775c2693b9c312180f3604
font_01_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 10896 bytes
SHA-256: 7e35a75cf9dfd23bb5143b73430151a990e269a4b5eeb10b9ac6d73f05fd6e83
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34