Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96e0621a0fdb23d…

MALICIOUS

PDF

104.0 KB Created: 2021-04-26 15:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf15936d2df85086fafa82d6d80ec53d SHA-1: 9784f5137b3b4322ec249d783bcd464f04e21465 SHA-256: a96e0621a0fdb23d85080809bdc11aba64226318791a09d74f974c0e33573550
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary lure appears to be "C programming language book solutions", directing users to a URL that likely leads to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=c+programming+language+book+solutions PDF link annotation
    • http://garderob-podolsk.ru/kaviditarefue4d.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/juxemodolatetufopuq2bve.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/30e22.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/bafonim_risafas.pdfIn PDF document text
    • http://scoretdho.best/sixaguramypef4.pdfIn PDF document text
    • http://palovedu.22web.org/kixavupaxegoxaximutom.pdfIn PDF document text
    • https://xodobojedabime.weebly.com/uploads/1/3/4/6/134675451/4864671.pdfIn PDF document text
    • http://return-0.com/super_mario_bros_3_emulatorl5c0e.pdfIn PDF document text
    • https://bepusubo.weebly.com/uploads/1/3/0/8/130814017/4464952.pdfIn PDF document text
    • http://farvestnn.ru/78074319909smu24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ed07cd1f-d003-46d9-b022-15cab53b23e1/rijiv.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/purpose_driven_life_quotes.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/fifty_shades_of_gray_songs_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4dc872-f832-47dc-af9b-c8981906c29a/vizio_m55-c2_stand_screws_size.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/how_important_is_honesty_in_a_relationship.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/7395612469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df2c17b-af44-4cfd-afdd-ece3e019e7ef/american_history_test_1.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/jukiximumusalub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f5c3a2-1527-4dc5-8598-cc7b08bffc17/what_rhetorical_devices_are_used_in_speeches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988c3276-3696-4f7f-82a3-9b90c956d56d/json_format_in_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56726f23-308b-4511-bcbc-2d85f04a294c/dodge_ram_3500_parts_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640ef329-054e-41ec-ac2b-107ebd1de537/29035764663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b78366-e965-457e-a7df-62435b4557d5/how_to_write_a_compound_chemical_formula.pdfIn PDF document text
    • http://fukogalijikufoz.epizy.com/applied_artificial_intelligence_a_handbook_for_business_leaders_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 4016 bytes
SHA-256: 403effb9c3c639814c148cac1e498e74bf8eb2f2dc2f9263a666fdeaf4abcb47
font_01_sfnt_off00013489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13489 5248 bytes
SHA-256: 189bfbb1261ec2598c7f986f076f6ab5153901764ce6759a30cf199a82beaae2
font_02_sfnt_off0001464e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464E 11704 bytes
SHA-256: 7372dd05bb3116a1312725c9c948f1d99185337ee9d7731b5f6b3aa64e0c0647
font_03_sfnt_off00016e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4D 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44
font_04_sfnt_off00018349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18349 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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