Malicious PDF — malware analysis report

Static analysis result for SHA-256 938a0d466428d4f7…

MALICIOUS

PDF

82.3 KB Created: 2021-10-01 02:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73ec4fde481d696ac63b3946ea57bc1e SHA-1: 08cc39c89f55b2e1ae3af4670f12b6c0f8feb261 SHA-256: 938a0d466428d4f76a6cbe86c953ae06c643526aa843506751f220265dacc322
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://runhouchem.com/upload/files/nelevegedawajuximabazuxep.pdf In PDF document text
    • https://slezanie.eu/userfiles/file/34392961558.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/49214843991.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/12096274455.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/monewime.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/rukuvogidekek.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/70330870654.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/21703986076.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/jewazosoketubi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nedidasunedowokag.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/xezejurakakabimunope.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mevorajufoxunopoxewogu.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/36804574019.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/35161364840.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/16580792145.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/59792234883.pdfIn PDF document text
    • http://netflor.pl/upload/File/73298053297.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/tiwotitu.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/wazipalog.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/11824283699.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/sotoviminemakire.pdfIn PDF document text
    • http://tabletopad.com/images/file/xizelovumal.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/52559805972.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/lufusafuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=camerafi+live+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10216 bytes
SHA-256: 40796f4dc38f6b8bca49df531d41aeffe3f026543985f81cc242d9bf63f36b3f
font_03_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 20520 bytes
SHA-256: 66f5b43faa023701737a44d8faa46f169f6ab3bea1a58a87bc3de98004a28d77