Malicious PDF — malware analysis report

Static analysis result for SHA-256 704c6adb7f60b89b…

MALICIOUS

PDF

92.9 KB Created: 2021-09-17 22:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b01b8876e47791ae416c20fc6b04fc0e SHA-1: 8be51ad439a798b790ec084240b0f73eda855ef3 SHA-256: 704c6adb7f60b89b58b3f98fb5209f387feb0afc08726bd1a6e173247eaf707e
146 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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://pixomot.ru/uplcv?utm_term=david+bowie+glass+spider+tour PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41a12247e---mevefeginig.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/71586117440.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/jakab.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/mexinapulawosumu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/83938140160.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/jodobozomamelidopusananaz.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/48630388119.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/verowuxigobipojinapez.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/90568174143.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/1764737508.pdfIn PDF document text
    • http://laduses.nl/image/file/mavulizegetuxobifega.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/18733688586.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/77343421253.pdfIn PDF document text
    • http://freewest.at/dixuzijubojukinuton.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///galirezikivuselo.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/11463039803.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/95903370699.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a254d8a38---gumawuragajegalokoriwilap.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/37859722761.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/99960373530.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/makerobup.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/74019367957.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109112003485338.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_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10856 bytes
SHA-256: 15c5605fedd196a2664cb570108416d72e6ae7a3f9a2c3373cc1e9980a60f778
font_01_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 18424 bytes
SHA-256: 9962eac277346efc55fac8f7bad0025be1ff06cab58097be3d801024cdcbdd99
font_02_sfnt_off00014db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1