Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc814e2d1288390…

MALICIOUS

PDF

76.3 KB Created: 2021-02-23 10:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1ed6ee3488e9ede8a2e8175a9f2da4b3 SHA-1: 28dc0789a21aa2ddd5823d1723293fa8320f344d SHA-256: 7fc814e2d1288390ba00f3dba759636b47e1e931223ef44ae87e61a5296ca4e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous external URIs and embedded URLs, many of which point to disposable hosting and are likely used to host malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, appears to contain decoy text related to a mower diagram, likely to trick users into opening the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=murray+46+inch+riding+mower+drive+belt+diagram PDF link annotation
    • https://cdn.sqhk.co/kimazibo/miajhhd/wewabedajemol.pdfIn PDF document text
    • http://help-igcopyright.xyz/two_way_frequency_tables_worksheet_with_answersuagpq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_602fd769b9ffa.pdfIn PDF document text
    • http://getcreditcheck.info/dungeons_and_dragons_5ed_character_sheetcrufx.pdfIn PDF document text
    • http://shop-you.xyz/what_reading_level_is_diary_of_a_wimpy_kid_wrecking_ball73wnw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392191/normal_5ff9189a1d94d.pdfIn PDF document text
    • https://numetigovav.weebly.com/uploads/1/3/1/6/131606493/wafegabitazanibokeni.pdfIn PDF document text
    • http://winoorama.fun/ar_15_banned_for_hunting55btn.pdfIn PDF document text
    • http://workshop-fb.ru/pexofafpa3cj.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/pelojelerinosen.pdfIn PDF document text
    • http://dirtygirl.fun/5089568570047r7c.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/TvHigVd/sword_art_online_c_mod_minecraft.pdfIn PDF document text
    • http://azorocheat6.xyz/6291787250123prx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_602a39d61ab1c.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/wamafefilisataxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/enter_the_gungeon_npc_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/yangon_local_tour_guide.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5816 bytes
SHA-256: ac52d4b68193e27ed4914da52f412b1d9e383cd84af19b8e95f97658244d5c83
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10328 bytes
SHA-256: a939794a3080f05333e402101255d84e22f56cba9c8587b8b70ea6564c051d7d

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