Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af860c01cae9c46…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 16:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2c6843f04f5b3cd886940230ae4dba0 SHA-1: ea15237ec9e33a6a2f41933ccc4be9bf82cdd13d SHA-256: 7af860c01cae9c46c1d7b7adeb753947b703c1600ef32d80a6f80f4a19d18aa1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of phishing and callback scams. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic specifically flags it as a callback lure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=filmwise+and+dropwise+condensation PDF link annotation
    • http://d2dgroup.net/upload/files/61736379939.pdfIn PDF document text
    • http://clanlogging.com/userfiles/file/23910670122.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/bisukar.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/69497382749.pdfIn PDF document text
    • https://chptravel.ir/data/file/90078646954.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pedumi.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/nelovenumusav.pdfIn PDF document text
    • http://ndt-ultratech.com/files/6183887092.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/11425684047.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/gojolo.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/7852242458.pdfIn PDF document text
    • http://mfcpavpos.ru/file/zojelulikopulasusebuwerud.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/92547287630.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/93584095409.pdfIn PDF document text
    • https://pindimana.in/uploads/file/sabuzarigasomine.pdfIn PDF document text
    • http://starma.pl/files/file/rixamatudonuzu.pdfIn PDF document text
    • http://sushibelovo.ru/files/48104848194.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/49977273480.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/vuletevafewepupajodilefox.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/40543012361.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/gupezexezesivepulamojaju.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/52530940031.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42a6eebc2---gotufubesejafitafixaja.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/60697762007.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/wunakapi.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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 10736 bytes
SHA-256: 70050dd4aba2c05731273f3fe052e9f1b28a018c84f92867e7aa9370cef61972
font_01_sfnt_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 17868 bytes
SHA-256: 32e36545c2519132ccef8c90fd7f7b31eb4ec43cc16b894431797f2cf171b05b
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1