Malicious PDF — malware analysis report

Static analysis result for SHA-256 7946b4ab41d9453d…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 15:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 800472a50277f399d3f483821978ecf5 SHA-1: c50ffb0ca57545e8394af83736f15c8be197d494 SHA-256: 7946b4ab41d9453d21f9392ee8c4776e836fb1e8471cca635bf1c063c13fb176
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://baarspo.ru/wix?keyword=sol+republic+punk+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/puwonereb/jzsijih/hill_climb_car_racing_game_online_play.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/jicricu/pedal_up_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/jfNAchc/dunia_games_redeem_code.pdfIn PDF document text
    • http://situbune.iblogger.org/96188875798.pdfIn PDF document text
    • http://wovidako.22web.org/60930043597.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/2423766.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/shihdgi/queen_greatest_hits_cd_tesco.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/gakufifeja.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/ghjdrjc/7715055949.pdfIn PDF document text
    • http://gikedipe.22web.org/birth_plan_the_bump.pdfIn PDF document text
    • https://zitakafe.weebly.com/uploads/1/3/4/5/134587302/dararajuxu_nosizerijowovux.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/b444b.pdfIn PDF document text
    • http://merogerofame.66ghz.com/dylon_colour_catcher_40_sheets_waitrose.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://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_531fb79cb1f9421195a8332321b5753e.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_6ea6e71845b64683ad7afae9a0dfb365.pdf?index=trueIn PDF document text
    • http://bigobawavelig.epizy.com/zofoseg.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_b3316e2bb75d447b814c057ed6c55f47.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_be90cfb126144354a1a5f2ade384d701.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_9fc53214939b4f38a6a7408f267cc5e6.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_04d72abf11fc4efc980326bfd2ff5d2a.pdf?index=trueIn PDF document text
    • http://sidegiri.epizy.com/zitokipuposujazoz.pdfIn PDF document text
    • http://zenifipepodu.rf.gd/31024504791.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_e296d0c60a7f4aa3989cff85f43152a3.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c35c3c1cf6614419875f6bf96d695132.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 5232 bytes
SHA-256: 1ee9cdf718ce097c2a3cfda79d25d1667b5b0ee14d70f1b89cf5634bda2a8e0c
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 11292 bytes
SHA-256: e32ca5698b8febc855d80d6b95f9d84e778c52db190b38b916a0a4b2274e0d09
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f