Malicious PDF — malware analysis report

Static analysis result for SHA-256 7591a0d61a99beb8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 14:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87163cb00b84c9be001040eb8660910c SHA-1: 04bd17a944f109a13561ae660d3d8ebe96a0745a SHA-256: 7591a0d61a99beb8a16930294ce1a5d96da0621ed1cbb508b479291745a50388
146 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The 'QR code redirect lure' heuristic also indicates an attempt to trick users into interacting with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=rust+building+base PDF link annotation
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zepitojedilalegakumu.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/98146784373.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/76267265832.pdfIn PDF document text
    • http://baoveantam.info/upload/files/9360233078.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/tagok.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091918143973499.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/37023364959.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/gazugasokabunoxawur.pdfIn PDF document text
    • http://webbuilders.com/files/file/xifabogizufusogop.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453a5f73cb3---xiruwovep.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f359a0e497---24624651567.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/99690977359.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vepexelanuronenifir.pdfIn PDF document text
    • http://tiquital.com/documentos/file/rojatojit.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/40831860876.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/77928662304.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/lupawididewoxu.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/nufezigixeguripowowevo.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210907152923.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/tepegomagidajim.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/64781896205.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/8954367064.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/2961558878.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://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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 10488 bytes
SHA-256: 6d5cf73efeb6bb91e25a1f1e13f8a919c7be818a12d7445f1110b962e325829b
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16116 bytes
SHA-256: 9ee5ec18dd546ef0f64217b6d349663e3a38ee443539f7e91f1cfa908eb6abc2

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