Malicious PDF — malware analysis report

Static analysis result for SHA-256 42115a4085987d18…

MALICIOUS

PDF

79.5 KB Created: 2021-05-10 20:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec235c8acc31e71418aa8974300bf45f SHA-1: 031cbb527081521156e2c0366d816e8d96a03f92 SHA-256: 42115a4085987d18030765ab3eca59e5c829c96674a038b2c9f38fdf8ce039d5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to cleaning a Dyson vacuum, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+clean+dyson+cyclone+v10+brush+head In PDF document text
    • http://healthyforczechrepublic.site/how_would_you_describe_fire8e1r4.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/ejdibhg/digikey_sense_resistors.pdfIn PDF document text
    • http://prizinsta.info/best_thing_to_clean_hot_tub_filtersb8msg.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/bogufifane.pdfIn PDF document text
    • http://lirelejavebot.iblogger.org/appendix_in_science_report.pdfIn PDF document text
    • http://vezdesami.ru/945343952973b9yb.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/6967917.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/fDULmne/stickman_rope_hero_2_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/bxIpaij/samsung_health_monitor_app_blood_pressure.pdfIn PDF document text
    • http://1offpark.xyz/harry_potter_books_set_in_hindicg69j.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/tabebozilar_lomowomuli_mogixiwobe_pagepepoxikap.pdfIn PDF document text
    • http://wide-do.top/jowemaxivepaxowovaip1hh.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/7665215.pdfIn PDF document text
    • http://sacredname.ru/importancia_de_la_comunicacion_librosbgl29.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/2DWMbfj/air_attack_2_mod_apk.pdfIn PDF document text
    • http://sq11mini.com/gojedaviguboxuvy4008.pdfIn PDF document text
    • http://afracheat3.xyz/microbiology_laboratory_theory_andfvkwy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukagodikuve.rf.gd/purine_metabolism_disorders.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/can_t_take_my_eyes_off_you.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/wotumejiparosa.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/47799611647.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/how_to_change_tunes_on_hs_mini_maxx.pdfIn PDF document text
    • http://kexafaxepel.epizy.com/endometritis_bovina.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_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 5576 bytes
SHA-256: 733bb120086434e000fc12b6df0501e8f3d339db4a3278b3a6f9b509719ecd60
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 11696 bytes
SHA-256: 26bd94f31349a4f459ebbae3a921f770696778f6fbd259eb549a0a1d634c1b1e

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