Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a829411427213a…

MALICIOUS

PDF

82.5 KB Created: 2021-03-30 19:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 35314c574686a7ad863bc76588f04a2f SHA-1: e3c5e5936370bcf83690652e8f48bc521a61b9d1 SHA-256: 16a829411427213a3499f99e04f7db9515a03629b44c9bafec375e23df1032b3
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing lure disguised as a CV template to trick users into downloading further malicious content.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=curriculum+vitae+template+for+accountant PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466659/normal_60095e5e4fe46.pdfIn PDF document text
    • http://cookwellbakewell.com/sokanidanuredujufoverryiyl.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/bOjbih1/ultimate_car_driving_simulator_mod_apk_download.pdfIn PDF document text
    • http://rodina38.ru/appraisal_letter_format_to_boss1dhnf.pdfIn PDF document text
    • http://marketitaly.info/55324840599o6ub6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_605c2005d13fa.pdfIn PDF document text
    • http://immortal-sho.club/rush_racing_2_hack_apkfswr0.pdfIn PDF document text
    • http://dexiserabasavo.mygamesonline.org/pisuwuravasuxufis.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/ajgqjhT/css3_grid-_template-_columns_repeat.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/richards_j._c._2020._curriculum_development_in_language_teaching.pdfIn PDF document text
    • http://tells.fun/p90x3_fitness_guideaxdyd.pdfIn PDF document text
    • http://roskycnmx.com/ethical_hacking_meaning_in_malayalamh4sm9.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/ggdhbw5/descargar_mercado_libre_compra_facil_y_rapido.pdfIn PDF document text
    • http://xozonline.ru/922263138061emza.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/cdLmngd/clash_of_kingdoms_heroes_war_mod_apk_happymod.pdfIn PDF document text
    • http://keto-s1.com/12307920428wu2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/gdhc4ii/92367021123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_d0c5f2a05469445b9129edac901dc700.pdf?index=trueIn PDF document text
    • http://tofujuwo.onlinewebshop.net/jiwizopaz.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_4912b84d67594a6ab293b03f76427d37.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 4948 bytes
SHA-256: 4e8956111712571ffb646ac1b5de5cc38ee0b9be0272db6b1903437723c9af39
font_01_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 11924 bytes
SHA-256: ed916cf594cdc9cba6b3cb2c0e45eb35c368d8773ad2975aef1749aa900bb761

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