Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea04523e7b123cc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 06:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab34fe53ecaf48906ca93e180b52e0c1 SHA-1: add537eab1568ce44e6d05fe7a5cf2514ff4bc38 SHA-256: 0ea04523e7b123ccc29201c17f6c15c116ec39162d00ff70e43a8c49d48e25d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://xn--aknmedcal-wpbe.com/uploads/file/74614096454.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/teziv.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/70828822819.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109032224095487.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/50813081709.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/52908195654.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/nexejeruwexovazabejit.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/38690911904.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/86137093608.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/zajixuvorisiburawad.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/45401930909.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kopipoleniz.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/31711489013.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/23982522458.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/76723392511.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/gexuriborus.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/xazuzesijuwilalok.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/94738041129.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/gawelabunapajijigeled.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/85934375945.pdfIn PDF document text
    • http://119pump.net/d/files/lasisineje.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/joxesule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+undo+an+app+update+on+androidPDF link annotation
    • 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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10348 bytes
SHA-256: 9ac2771099d09ded82e26f193ae700f5eefaa8de16327a0121df85609df3cd48
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 18388 bytes
SHA-256: 8ae0ac2e49485fa89a4e0bd2a637a064382386a76da02970fbf973d47112364a

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