Malicious PDF — malware analysis report

Static analysis result for SHA-256 c434083ce1213919…

MALICIOUS

PDF

79.3 KB Created: 2021-04-01 14:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73fa1ee4db8b366cde27d596ba937fca SHA-1: 51a64ec80a146551273879542b6c4b38f2ea1e81 SHA-256: c434083ce1213919e58812a99346db54690c19b1a36403fc38d898926fd32f7e
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to improve search engine rankings or distribute malicious content. The primary suspicious URL, 'https://seumenha.ru/strik?utm_term=zebra+gk420d+driver+download', indicates a potential lure for users seeking driver downloads, which could lead to phishing or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=zebra+gk420d+driver+download
    • https://cdn-cms.f-static.net/uploads/4445101/normal_6011ac74426c4.pdf
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fce987467a05.pdf
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/2b7ca72.pdf
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/legurukilum.pdf
    • https://xubetiduradana.weebly.com/uploads/1/3/0/7/130739761/rijagobupus.pdf
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/5068298.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_0dc6fa8612724c8db21e3486677196b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c44db14-88e9-45ee-8391-e68f782cf79d/54589540619.pdf
    • https://s3.amazonaws.com/warapagefasovi/free_email_templates_for_outlook_2010.pdf
    • https://s3.amazonaws.com/lixisariwulo/19359384874.pdf
    • https://uploads.strikinglycdn.com/files/d8c0edfa-8c70-4c59-a2c1-e4fdc7d9a4cb/numerical_methods_with_matlab_implementations_and_applications_gerald_recktenwald.pdf
    • https://s3.amazonaws.com/satedafadusizo/citizen_kane_script.pdf
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_31feaf0f6c5b4c5fb011e5d45f6d7a2a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f457e79-f16e-4e45-9115-87f8a7e3aed0/woragofenifoxuzijo.pdf
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_bd189c89ae5b418c9b3a3c8d8a2d10d4.pdf?index=true
    • https://s3.amazonaws.com/liwafo/87435329573.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_cc40cb098f12421b81a1e4852da87fba.pdf?index=true
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_54b3650386844a15bdbd018ac96b2246.pdf?index=true
    • https://s3.amazonaws.com/muxegeza/dojemisejuran.pdf
    • https://2978fa49-077f-489e-bef2-0e177375ffd3.filesusr.com/ugd/50ba8f_136d72acaee34f269d066f3178d078f5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d7.bin
a0be01809c2efdacc09bf77bb45d85945bf8d2edaaddbd01f95354cdeb7cf21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 5196 bytes
font_01_sfnt_off0000fba8.bin
270c099892c8e99eacec29d95f714858bfac90febf84702f727003b9d23bb856		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10700 bytes
font_02_sfnt_off0001206a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 4324 bytes

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