Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1ec90666102427…

MALICIOUS

PDF

76.2 KB Created: 2021-04-24 16:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: badf0eb8da95f3e1aa0015f4aab25ee7 SHA-1: 23ea04cadecdb8e7c289b337d0cf2ce7afb193ac SHA-256: 3a1ec9066610242717858d0f98c01b8033a82e3e8ea8fd3c1a85ade92a4fb6f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a domain associated with a link farm, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to making money, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=make+money+flipping+houses+reddit PDF link annotation
    • http://alphabitx.com/lumiwlhl1c.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/gfojbIm/71354386205.pdfIn PDF document text
    • http://shoop-fr.ru/wonaresuparamaki9d2tb.pdfIn PDF document text
    • http://mkr-olimp.info/wufotaramivabejv8tde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_60383eb384896.pdfIn PDF document text
    • http://canlisohbetim.net/free_likes_and_followers_for_instagram_apkfdzev.pdfIn PDF document text
    • https://cdn.sqhk.co/bewamufara/hAprha8/36281044686.pdfIn PDF document text
    • http://reweder.site/watch_salems_lot_2004_online_megavideoba0bx.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/hdjaJrP/e_trade_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/eW2Djhz/racer_underground_mod_apk_unlimited_money.pdfIn PDF document text
    • http://skameyki.club/401408877795zq8v.pdfIn PDF document text
    • http://demask.fun/turegeginifojejevugebenm7jb.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/jhdhehb/pizza_maker_apk_pc_download.pdfIn PDF document text
    • http://usesol.xyz/i_thought_love_was_only_true_in_fairy_tales_shrek1dm66.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/2fyhiie/hokey_meaning_merriam_webster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_600b38b178c34.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ifgcvif/the_real_story_of_halloween_history_channel_documentary.pdfIn PDF document text
    • http://giwosesupalu.medianewsonline.com/catholic_bible_in_tamil_free_download.pdfIn PDF document text
    • http://baltika-trans.ru/rasozizajomukopabudodci1nv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupitatip.atwebpages.com/15697329981.pdfIn PDF document text
    • http://dafukip.myartsonline.com/brother_2270dw_setup_mac.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_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 5628 bytes
SHA-256: c42a3731b43bf3fdbdb373230c2844b7ff8a5b36e6e3dca2c2d93db06c0fc883
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10820 bytes
SHA-256: d07dfce77e914e8a4130ed8a21c0f6235a3d399690475208c4b5f681e67ac6f1

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