Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3bf6c2399aab62…

MALICIOUS

PDF

91.2 KB Created: 2021-03-25 03:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e17af4a595b3612aeab5b5d45bc4fa4 SHA-1: b1ba4b26f6e02dcde00147d4eebdf58cc3daa889 SHA-256: fd3bf6c2399aab62140f76c3b45f50bfd2c7e32c0f4600dfdfb9a328d38581ad
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a common tactic for distributing malware or directing users to phishing sites. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/award?keyword=aggregate+demand+function+pdf PDF link annotation
    • http://menformula.xyz/busosodenoparpre4.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/agggdji/facebook_messenger_games_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/5hjiaii/german_anti_aircraft_tank.pdfIn PDF document text
    • http://forkidsshop.online/how_many_users_can_use_rosetta_stone8l9jv.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/JfijewH/day_r_survival_apocalypse_premium_mod_apk.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/foporolutamik.pdfIn PDF document text
    • http://fsbsiod.com/98769899721tlz8e.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/X14Qq05/swing_flying_trapeze.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/ggijwge/snakes_and_ladders_rules.pdfIn PDF document text
    • http://janusadow.mygamesonline.org/poniraroxafu.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/kafuxirakunaxuweragu.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/58362439597.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/JZh0Rgd/oppa_doll_premium_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_e4069a9f71284e0ab17b27195f0c6548.pdf?index=trueIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/kelaxu.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_2896dbdeeb1a40138a5a8b9878863d39.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_12911c496ae44b04aecea176c2b634f9.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_b6b16d76b61b4f3c9fcc9eb09efd1ae9.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 5256 bytes
SHA-256: 25db2c1b7a8feb3c9af20359a0f7c76509ca0d834f3705ef28b767c00c8edc5f
font_01_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 12164 bytes
SHA-256: 6ced5f6daa93f6850d0cc96dcce0170f0ea67903ed769a147643d00d638cf0a0
font_02_sfnt_off00014a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A56 16112 bytes
SHA-256: 116e1aefc1bdc9fdbdc8bc4ca32ed8fc2a9096b6ae60b76e258fcc2d5524df3d

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