Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d2162f0f6feb27…

MALICIOUS

PDF

93.6 KB Created: 2021-04-12 15:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7595c8070972064831c86d3c19c1cbfd SHA-1: b8e9fa508fe15320709f698af1d640757aae6a6b SHA-256: 17d2162f0f6feb27e3197f22832800318a8e929a4e345edc05904cf87e2ce251
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDFs hosted on various domains, with a significant number of these domains flagged as disposable. The primary external URI observed is https://dugedepap.ru/strik?utm_term=ulysses+poem+explanation+in+tamil, which likely serves as a redirector or part of the link farm mechanism. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=ulysses+poem+explanation+in+tamil PDF link annotation
    • https://cdn.sqhk.co/tokejosanawo/bjimxg8/play_earn_money_app.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/90b203cc2acdc1.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/61447732594.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/badminton_technique_tactics_training.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/d15Hhem/73231644141.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/jighZ7a/nunoridibefojabulevafu.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/ekpGMOb/retinugexidubavipixebupo.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/gumatosewewanon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/nofuda.pdfIn PDF document text
    • http://dopovis.myartsonline.com/encyclopedia_of_science_arihant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa408c50-fa2a-4798-92e9-df11297a597a/best_bookcase_speakers_2020.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_5e3eb2169f004f0da4e5a48105bcd49b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b14e60-7349-42c2-84d6-8a21bb72d1f8/jojazojopategileju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5e408f-fd7b-434e-bd39-7e3b4237eb76/ariston_washer_dryer_combo_door_wont_open.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_e3c0e4f58d7c4968a6322e0a696ffa3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c751be2-0e72-4c2f-ba2f-5ae082b59829/miniature_dachshund_puppies_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3087db-919c-4a2a-b5fa-8d2c11e65381/rise_up_singing_chords_and_lyrics.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_1eeabb655ddf4c87bb62c070fb64d873.pdf?index=trueIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_b684d70e77704fdcbe0874f5bda0fe7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ae50ae-fe7d-43a6-b4d1-ccc38f08aa79/what_is_double_protein_in_subway.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_0a82f8925fb748a586f97cba416eaf59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05f296a-92de-4efb-bdc1-13c850412e40/how_to_win_the_texas_lottery_scratch_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a4f37a-4338-47ec-bfa2-9c13b0dd085c/zojirushi_cd-jwc40hs_water_boiler__warmer_4l_silver_gray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffb772b-d8b3-4d7a-aca3-2ec822a47559/gegezalo.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_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 5028 bytes
SHA-256: 6be9052c4003306aed961168923b00c2ad3e15c26a98925735728345ee58ce35
font_01_sfnt_off00014353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14353 11152 bytes
SHA-256: d60f9866aafbf504555dfa7ef0b16ac1116e70b94532ec298775f7c4695d8bf3

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