Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c5401c154b102d…

MALICIOUS

PDF

74.6 KB Created: 2021-02-13 20:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cc7931113f432575905a741a8abc6622 SHA-1: c0a708fa1254e03567867d7c765b4b7713458a64 SHA-256: 95c5401c154b102dfe193cf2f965cbc2b18be7f5de60ca49f82775d9c39c5933
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://jottigo.ru/aws?utm_term=android+application+not+installed+for+this+user', is presented in the document body, suggesting a lure to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/aws?utm_term=android+application+not+installed+for+this+user PDF link annotation
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/211273.pdfIn PDF document text
    • http://thelait.pro/72241347781tjrrl.pdfIn PDF document text
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/lefemuguromani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5ff66c732b00b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_6014a034e099d.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/2412330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5ff8b6d1c8df9.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/xolomaxajofe.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/cd808ba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/acetylene_will_react_with_copper_to_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/aaon_rn_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/xiles.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/49990937827.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/95312637007.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/how_old_is_darrell_sheets_son.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/chhath_puja_song_dj_rk.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/abdul_qadir_jilani_books.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/cappuccino_song_full_hd_video.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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 5232 bytes
SHA-256: a0b31b86b3cbda8d1e2e3ed424984014b659a99e9dd95c350db6bc87e24b803e
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10588 bytes
SHA-256: 26bc84e4b7a71279b9719fba6d324ba1af35f9bfe73bf8bd2101324e014d19bf

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