Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc305ed7dc8138bb…

MALICIOUS

PDF

96.6 KB Created: 2021-03-07 22:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 12de7f6c836cd9dfe167509474dddf6b SHA-1: b1e5afafba1a650d9a252659fb7bcea1ee3b9f08 SHA-256: fc305ed7dc8138bbc3725d5e9e38005b19a0cbd2202d404a5ae6f989e164164b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=leadership+and+self+deception+free+download', are likely used to redirect users to malicious sites for phishing or to download further payloads.

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://baarspo.ru/strik?utm_term=leadership+and+self+deception+free+download PDF link annotation
    • http://mudikovarew.mygamesonline.org/kenmore_top_load_washer_disassembly.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/b1f429f1bfa85.pdfIn PDF document text
    • http://my-favshop.online/dubai_opera_guided_tourfcjq6.pdfIn PDF document text
    • http://matroskin.space/asvab_math_questions_and_answersumwrp.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/julius_caesar_by_shakespeare_character_analysis.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/lixijalax.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/gupojuv.pdfIn PDF document text
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/nukinikapos.pdfIn PDF document text
    • http://magic-world.site/hey_jude_movie_subtitleseo3xi.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/4828996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8c65b7-f085-4723-b7f3-9bac8817784d/88852725274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631cc4c8-11c8-4e7e-a8ef-5c7edee4cb6d/10605127680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04d8321-3e1f-4dff-9307-214e09e689c8/wixudajanuguzokataw.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/laravel_enable_error_reporting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075c6aed-ebf3-4c2f-8487-3e90224f7235/why_we_sing_by_kirk_franklin_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/hc_04_bluetooth_module_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d508663d-e9fe-42b5-bbb3-e0c7d2a5de85/wovajudutinujogareto.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/ti_84_plus_ce_programs_algebra_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f6d351-1fdc-4924-98ff-9a33dc84c4c7/stephen_crane_maggie_a_girl_of_the_streets_theme.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B1 5276 bytes
SHA-256: ef413064fb500a2528822050572d6a4759ff6fd7ec52dfee44137ba51bf03618
font_01_sfnt_off000144ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AD 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00014d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3A 11720 bytes
SHA-256: ada7bfc9a5c4bb8b6e9f63703f5449464a10a043cae9fe6f9e010866be28e4f5