Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6235afdcd4e58cf…

MALICIOUS

PDF

80.3 KB Created: 2021-02-28 17:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21ac3030beec7338ee885b020eba5100 SHA-1: 9b09d347d58214734a889d02362a1582cfbebd11 SHA-256: b6235afdcd4e58cf2fe8558efdbbe4522d030b8bb1ae1d5b961d2f6aec61929a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'basic accounting interview questions'. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=basic+accounting+interview+questions+and+answers+for+freshers PDF link annotation
    • http://lasns.fun/51020120310285pr.pdfIn PDF document text
    • http://onenature.space/quran_with_spanish_translationpvleu.pdfIn PDF document text
    • http://nalapagized.22web.org/free_cricket_chirping_sound.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fcf0b27de23e.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/how_much_is_a_gimp_suit.pdfIn PDF document text
    • http://businessoutsourcing.info/dudekafedufenifenenewisuuhb5a.pdfIn PDF document text
    • http://ehaberdevlet.com/when_is_the_never_fade_movie_coming_outqbkpi.pdfIn PDF document text
    • http://doporujela.iblogger.org/envato_elements_after_effects_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5fcda166b3ad3.pdfIn PDF document text
    • http://giocodigital.website/kala_patthar_movie_songs_pkfkuja.pdfIn PDF document text
    • http://lalexejiwisejul.iblogger.org/density_of_salt_dissolved_in_water.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwomonemagup.epizy.com/dividing_complex_numbers_worksheet_kuta.pdfIn PDF document text
    • http://dojiseb.epizy.com/62286261080.pdfIn PDF document text
    • http://leludopovofa.rf.gd/sulejakafa.pdfIn PDF document text
    • http://muxobuduxude.epizy.com/girl_attitude_status_hd_video.pdfIn PDF document text
    • http://xaxuvep.epizy.com/free_theme_templates_for_powerpoint.pdfIn PDF document text
    • http://dogumimuzelu.epizy.com/english_animation_movies_free_mp4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 5576 bytes
SHA-256: b4a7276105b2d070f1e23c476f8037a356987b0682e6c66bdee328012ce1a2d5
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 10236 bytes
SHA-256: dd26bc6e705f507e4d727c28374da98587670ef83b4a2fcfbfa1cb27a2f718cd

Open this report in the interactive analyzer, or submit your own file for analysis.