Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d949fe9e5e31e4…

MALICIOUS

PDF

84.8 KB Created: 2021-03-30 22:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a378778c70d3aa4eb84d3f363727b9 SHA-1: 019a141efafc18d556a8ceedb06de63b3a2572ad SHA-256: a0d949fe9e5e31e4ba29a8e3c84ad9a21373910f4a237ce004b40715c428847d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of an SEO link farm designed to manipulate search engine rankings or direct users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'case study interview pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=case+study+interview+pdf
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ff139d178e80.pdf
    • https://cdn-cms.f-static.net/uploads/4426424/normal_602109c725305.pdf
    • http://idealslimitalia-ufficiale.site/jazz_composition_theory_and_practicektk2n.pdf
    • http://xijipeva.mypressonline.com/fojupewuvawesapujezanaba.pdf
    • https://cdn-cms.f-static.net/uploads/4424935/normal_60172d020764e.pdf
    • https://cdn-cms.f-static.net/uploads/4484631/normal_600c6508ef0f1.pdf
    • https://cdn-cms.f-static.net/uploads/4424696/normal_600e33886a003.pdf
    • http://nout-prokat.website/928148942467gf6k.pdf
    • http://danoguvokapijof.medianewsonline.com/nofukelonumosasasawasuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_6a7f9f6509d84fe19f9eeed5de9ce72b.pdf?index=true
    • https://s3.amazonaws.com/xewamejixolefaj/walipelusuzis.pdf
    • https://s3.amazonaws.com/napejaxosinages/gopamipi.pdf
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_96b0d685167a4719a553b0782f801d57.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/cafeland_world_kitchen_mod_apk_latest_version.pdf
    • https://s3.amazonaws.com/megodipewukitoj/los_angeles_kings_schedule.pdf
    • https://s3.amazonaws.com/ligole/75174548821.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_c03b0cccb41d4b68a1155c32c4454a90.pdf?index=true
    • https://s3.amazonaws.com/dugibabafod/traditional_animation_for_beginners_book.pdf
    • https://s3.amazonaws.com/pirofopafu/it_is_difficult_questions_to_answer.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_514291164b8f4fbdaf98fab188a1f6bb.pdf?index=true
    • http://pofitubawonu.atwebpages.com/97192959285.pdf
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_ac622cc9648f4223ade0a7df76149a57.pdf?index=true
    • http://lodumojokexiku.onlinewebshop.net/xuliluma.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_off00010f04.bin
5c4573efda1db6c4db949eaad11c0cb0385d7b6149017ff97d729d1b0b7c0b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 5164 bytes
font_01_sfnt_off000120bc.bin
8c4a4b9cc66cd39f2f476b4ace78d0dbac1ae6c49e7526fe31dac045ca83cdbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 10768 bytes

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