Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4f7ac9784b1e16…

MALICIOUS

PDF

94.2 KB Created: 2021-05-26 09:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd187e74001f20abc2d7c0fdb8966701 SHA-1: f80dec12b9245ad8824b976b398b21a42f39ffb2 SHA-256: 0c4f7ac9784b1e165a4ec17624fee20a12edfafff741925c3791071f792fa2e7
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, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body's deceptive title suggests a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=what+are+the+5+types+of+context+clues PDF link annotation
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/5362572.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/pisikupexudo-gixoxuvo-sufed-buwolajijad.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/rarirexu_rolexujuvab_logawe.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/9ab81f9.pdfIn PDF document text
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/454405.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/21c427ca39556.pdfIn PDF document text
    • https://jazolesapixol.weebly.com/uploads/1/3/1/4/131453041/joronemejibobi.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/vakujupumare_jevato_saxonolal_wasosepudivu.pdfIn PDF document text
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/pirezuf_kuvofoleg_paxuzuxanivom.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/tomevosuxegijoropabi.pdfIn PDF document text
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/nobete.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/sebuwimerenegi-togezosisi-werasonobubibu-dasupikol.pdfIn PDF document text
    • https://vakevugulipew.weebly.com/uploads/1/3/4/5/134507067/e6b3b870425.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/pelori.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/ee8a9cb5-166d-44de-ad09-66f01b2f3e58/basic_english_grammar_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75227db-f743-4aaa-b02c-8b60388fab3e/27637156640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48810c16-7388-4aa1-a8ad-413039bf2223/ge_profile_microwave_oven_light_bulb_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b8deac-c4b4-490a-8425-6bbc4922f617/how_to_get_probability_density_function_from_cumulative_distribution_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898b0f4e-3255-40ca-ac69-6990bceb0702/99421767334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f2c155-024a-41c4-8705-0772878e4882/dafikasozew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af6bbab-84f2-42de-a09f-587ebd0e9d4b/kimapijizebomokitawiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb468647-1c34-4772-b159-09036d90e889/74449931539.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 5408 bytes
SHA-256: 50033844e2202f85e2fcf3c92332b2033f922c889dfd292ea0192fd75e91aaa4
font_01_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 10452 bytes
SHA-256: a7d805079b21922bd7e323dc701a7506c4b91f04610ca14bfcf5c47ebc85f92f
font_02_sfnt_off00015435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15435 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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