Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6d969fb600212a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 19:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cc0b40f1ffd32ae0b3f0caae08ab3a3 SHA-1: d6760cb08b62341d6f229a5e8e50671f2666473e SHA-256: ae6d969fb600212a658d6e26d5958cd90d5aed47c017ac5a6e04028f7ee761e7
146 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm. It contains numerous embedded URLs pointing to PDF files hosted on various domains, including one using a raw IP address, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ijaetis.org/ckfinder/userfiles/files/wopubosajo.pdf In PDF document text
    • https://rajaketiga.com/contents/files/togeguzinemaxigifonijoduz.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/zezifufewawufidila.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/zunefugebulijujad.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/54202783696.pdfPDF link annotation
    • http://kool-house.com/upload/editor/file/90576803760.pdfIn PDF document text
    • https://somogyplusz.hu/files/raxadovenemesujowowovunex.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/61390905593.pdfIn PDF document text
    • https://granitnet.hu/editor_up/63709069470.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/befos.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/zupajezobizamejol.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/9783557525.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/tomunuguwodaxugi.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/zixatagijopewusinaresasa.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/1347568158.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/98010152857.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bb5f270741b4d8c1e5bcf1414b208819/lorobejud.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/revivakexezawumisowimot.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/kibigekavex.pdfIn PDF document text
    • http://elitvorota.ru/f/file/kovesetu.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/91202576883.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9ca3c57c---gezukekado.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/58207372302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=silent+ops+android+apkPDF 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_off0000c010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 10552 bytes
SHA-256: 21a334c44e04bd21bbcc96ddba48f3fc982ca1d19951848d8eb9b23de7b905c2
font_02_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 18012 bytes
SHA-256: d1601016e2b24dc89dffb5a1e63e4c7a551919432e65c2e15091486b281f3533