Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c15c7aa860a5c…

MALICIOUS

PDF

73.7 KB Created: 2021-03-19 12:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f8f6fda00c7db5ba06539a7a6b1797b SHA-1: d8162d7fdee7ad7fa6bea1a5b20ba9edcf27ee0a SHA-256: 227c15c7aa860a5c7b4003cb97aff20ee505c00a04eec65c3784e269f568ad73
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=katalog+kabel+bc+supreme+pdf
    • http://mandarin-fruit.space/electrochemistry_worksheet_dr._lara_baxleyc76pj.pdf
    • http://faceskinagainbeauty.xyz/how_to_train_for_fitnesstz64o.pdf
    • https://dezubawutojowi.weebly.com/uploads/1/3/1/3/131398539/suges.pdf
    • https://cdn.sqhk.co/juzosugun/ifLsaEg/portal_gun_mod_mcpe_zip.pdf
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/9885927.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60299ea178142.pdf
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/fepaba.pdf
    • http://g2am2e.xyz/where_am_i_at_on_google_mapsrfzo0.pdf
    • https://cdn.sqhk.co/noxisoture/6Wetgic/buffer_overflow_stack_exchange.pdf
    • https://cdn.sqhk.co/vapumojemov/g4FS3gc/nfl_network_stream_hulu.pdf
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/mazamopobelize.pdf
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/disifefako-zemanavukup-wizikunemuva-nopukumewudara.pdf
    • https://jofesubuz.weebly.com/uploads/1/3/4/7/134775001/3b471.pdf
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fcad706d4df5.pdf
    • https://mexepefavofuj.weebly.com/uploads/1/3/4/6/134659137/6085102.pdf
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5ff9c7ed38824.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tazibabebamep/45155708085.pdf
    • https://s3.amazonaws.com/kudufigunabi/analogy_questions_and_answers_with_explanations.pdf
    • https://s3.amazonaws.com/nakuzafol/72215149712.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14a.bin
6d5e1a2efec58f11a77ebe758c45ce71c88d218be175ac1f0c941e43a79da899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 5648 bytes
font_01_sfnt_off0000f465.bin
db3aa99bb4becb7470c852b63c16113418429aee50aacc87c27f989a7cfa0c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 10816 bytes

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