Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd83df5c68203ca6…

MALICIOUS

PDF

76.2 KB Created: 2021-01-20 20:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c8902b0284bac489a1dac34c302f5f73 SHA-1: 5dad529a632c278e6badd17488f56411d54c3212 SHA-256: fd83df5c68203ca670d3b3e4c73f69b5bebfbed77f7dae13c4181c07e32244a9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or link farm strategy. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF is designed to redirect users to external, potentially malicious, sites.

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://traffnew.ru/123?utm_term=heo+quay+da+gi%25C3%25B2n PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8a57058e1f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fedd3dd6d7f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_6007e3849e590.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/3jcvn26/68480929120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5f9773e356eb6.pdfIn PDF document text
    • https://site-1168018.mozfiles.com/files/1168018/where_to_buy_finger_basketball_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/gdhepGX/kizekos.pdfIn PDF document text
    • https://site-1171549.mozfiles.com/files/1171549/82308837814.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/j8shahs/zuvavusiwufituzotusowelo.pdfIn PDF document text
    • https://site-1178179.mozfiles.com/files/1178179/birds_sound_ringtone_for_android.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/transparent_lock_screen_wallpaper.pdfIn PDF document text
    • https://site-1172175.mozfiles.com/files/1172175/miraculous_ladybug_fanfiction_chat_noir_almost_dies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff687e6530d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://devepovamijube.epizy.com/xaxoruduketilajala.pdfIn PDF document text
    • http://dagajevefud.epizy.com/furupakov.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/rimemega.pdfIn PDF document text
    • http://loxosufodu.epizy.com/nizobuk.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/31143917978.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/speech_in_the_virginia_convention_questions_answers.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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5012 bytes
SHA-256: 14df56d97b70ffb201deeca3f110ad0979e5c4a11a83d431532c54429960c9b6
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 21916 bytes
SHA-256: 20ad3996af4c5b6c1250aed78ab6cb7dbe0a87fb458be54f716e771f26d5e922

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