Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da1685a4ba60731…

MALICIOUS

PDF

103.0 KB Created: 2021-02-22 05:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 09d6e0d26ec57c11612f90578101e29c SHA-1: d95190f71e3d177d87256db86047705cafa7bc01 SHA-256: 5da1685a4ba607312b24725044df5ab85356342b41d0db0ae593930809f7f053
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 phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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
  • 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://jacksth.ru/wix?keyword=high+performance+leadership+manual+pdf PDF link annotation
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/7a2fd3c79a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6030e71350e7c.pdfIn PDF document text
    • http://turogitirimutax.22web.org/ropikewujotoxuso.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/183b47b8ef8.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/9171116.pdfIn PDF document text
    • http://xolimaked.iblogger.org/ctet_exam_2019_application_form_last_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fe6601979397.pdfIn PDF document text
    • https://wijirejilape.weebly.com/uploads/1/3/2/8/132816202/ef3ef563cae.pdfIn PDF document text
    • https://sasurejif.weebly.com/uploads/1/3/5/9/135966776/kozulifesakibukut.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
    • http://gisobugiwe.rf.gd/gekopusasiguxasazirofosaz.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/dopuwobadosonipojozej.pdfIn PDF document text
    • http://firasakujataj.epizy.com/83487440223.pdfIn PDF document text
    • http://xesesezaxemu.epizy.com/jowetefim.pdfIn PDF document text
    • http://lobexot.epizy.com/what_is_the_scope_of_iso_27001.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/9594205021.pdfIn PDF document text
    • http://nixixik.rf.gd/1995_mercruiser_4.3_oil_capacity.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_off00014aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAA 5332 bytes
SHA-256: 386e85305671a78d6c13ee3705d4231bacf8f34b3a7c78f7a1196e2fb99d462a
font_01_sfnt_off00015c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C98 10476 bytes
SHA-256: 8234a25332d8205eeb16f9abf14190ee23faf6ac7f8580fcab93a13e414fbe8a
font_02_sfnt_off00018071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18071 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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