Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44fd13fc0ccd195…

MALICIOUS

PDF

67.8 KB Created: 2021-10-01 15:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0475c210ec452fe4a86de40a62341085 SHA-1: fa7d0337abcfbaf1619d4fb22d9d528c6de1a9e1 SHA-256: a44fd13fc0ccd195712f7f3a134ea63a2a01812236f516cede730deb36d1f580
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to disposable domains, suggesting an attempt to redirect users to potentially harmful content. The PDF structure and embedded links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=android+wardrive+app PDF link annotation
    • https://mayphotocopydogia.com/upload/files/65257285996.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/fitowasewadi.pdfIn PDF document text
    • http://apvn.info/userfiles/file/sogufivejobikag.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/kavekixabezivi.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/76539742989.pdfIn PDF document text
    • https://t2sc.me/userfiles/nufubipidoxekabibikegovav.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/26168698603.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/lanunogo.pdfIn PDF document text
    • https://ebooksweb.net/files/file/votadumoxalegolu.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/50079764843.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/9038008747.pdfIn PDF document text
    • https://resicolor.com/upload/files/45021953679.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/14967977219.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/69732672474.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109150913166366.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/tikoxitatebag.pdfIn PDF document text
    • http://tdbm.vn/upload/files/bolafuxokoxot.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/bozomoremadanetizefatav.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/zuxinaxogajapozan.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/76319449822.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sigizoxuxu.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/72744389835.pdfIn PDF document text
    • https://penal-garazh.ru/files/zuxepozexezoxugitutugude.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_off0000ac24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 10204 bytes
SHA-256: 58abab8eed36132a140cce173babfd5f758f3d5364d2a84270fc12dab5e1751a
font_02_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 15124 bytes
SHA-256: 1a9dbe384ca8e9cdf44935a3229acf034a0076a447e39c08ab9edacb3db35ec3

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