Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f7e4794f3ed3b3…

MALICIOUS

PDF

74.6 KB Created: 2021-01-17 21:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fb470a1f3f1739e23b63c09bfc9be1be SHA-1: 30a024136d1f130eb549d489c0b8862e62c6c40b SHA-256: 84f7e4794f3ed3b3f371079154b8f0027fa428fe46a565171b0eaa454d21470c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to a "Vertical phone system manual". No scripts were extracted, but the presence of external URIs and the ML/AV detections strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=vertical+phone+system+manual+9224 PDF link annotation
    • https://site-1168046.mozfiles.com/files/1168046/femesokuxuzutuvotul.pdfIn PDF document text
    • https://site-1246781.mozfiles.com/files/1246781/vexawotinupogub.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/tikapuful.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/djd82Xc/jomepuvujegikevewuwakan.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/hfgWiwR/warrior_cats_game_on_scratch_thunderclan.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/NuCient/science_lab_safety_posters.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/ggdKhiC/nolepegunanamosudis.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/jY6giii/razupavulafudewomopano.pdfIn PDF document text
    • https://cdn.sqhk.co/tokejosanawo/bge8vLw/28960764022.pdfIn PDF document text
    • https://site-1171454.mozfiles.com/files/1171454/artillery_3d_printer_genius.pdfIn PDF document text
    • https://site-1217552.mozfiles.com/files/1217552/gun_mods_1__12_2_minecraft.pdfIn PDF document text
    • https://site-1179802.mozfiles.com/files/1179802/gazutukonuviraga.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/ghc80jh/diablo_3_season_21_necromancer_poison_build.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixatax/31477543917.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/gamanifuxigen.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/vidmate_2019_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/dowry_system_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/que_quiere_decir_movimiento_rectilineo_uniforme.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC169 5496 bytes
SHA-256: ee8f6eb1dc5a8becd97af71e5b4e46f4dfb87005a4833aaa76e74687cc232694
font_01_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 11016 bytes
SHA-256: 7d8e8281e2a3afbf14865b60372c2c3916abd9993a7451c424e3317964a11640
font_02_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 16060 bytes
SHA-256: e126d4d47b8ae1390ec9a66c31ff07756c9f5b69add7110d895e6152604999da
font_03_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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