Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d7a90397604770…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 17:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9017fa94607c0930f901912af3b72211 SHA-1: 8eede63a8058e6947d4903e97ad2fbb71562f705 SHA-256: 05d7a903976047700140bb89b55e0b36139af28f0a225712d0b1d2caeecf48a1
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one that mimics a search result for 'linkedin learning reviews quora', likely to deceive users into clicking. The document's structure and embedded links suggest it functions as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=linkedin+learning+reviews+quora PDF link annotation
    • http://rumurel.mywebcommunity.org/magnum_inverter_fault_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/niau0ij/20454841745.pdfIn PDF document text
    • http://pinoxisar.iblogger.org/ximedopej.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/taurus_millennium_pt111_g2_size.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/how_to_att_landline_call_forwarding.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/cjajfQt/path_through_the_forest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/hewIhi7/gakademinuzo.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/metal_gear_solid_5_review_gamespot.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/toSddjb/fruit_slices_for_slime_michaels.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/0e2d0fcc-8e3d-4845-8955-f67b3e1eff62/mogixodozojosefasod.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_f4eef2a6c8414de88e04027a55d1035f.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_f816b713b6c64e5ab2d282158ad12ee7.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_8be1d279172e4043895035e20b9d8747.pdf?index=trueIn PDF document text
    • http://rorewoj.rf.gd/uk_biodiversity_action_plan.pdfIn PDF document text
    • http://zimemotom.rf.gd/ponemixe.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_9398c140c8554ab389b07fbec7daa2af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d9df4d-7918-4168-9813-e8912bfe7334/yajurveda_trikala_sandhyavandanam_kannada.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/ruvulupewawusarimisus.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_0bbdfba90f244b1c8f60e2fd0766b7e9.pdf?index=trueIn PDF document text
    • http://bamasivira.rf.gd/92119316079.pdfIn PDF document text
    • http://napuganenafu.rf.gd/93598175251.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_281314babee44d94b74fc6a9938fd677.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7571c28-14f2-4c93-a2b1-221bc74dd007/59938099063.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_b950e04841694b7c9755dae02305febb.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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 5080 bytes
SHA-256: f74d87f3b0daf7dda31f0c6e2fc2bc25a5ceefce08c5566b9556f2ccd7b366bb
font_01_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 10172 bytes
SHA-256: e373a5798e7b3c4df4ffbed17f525b8d9102d15ce56b817c7a4cad0a4be4582c
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3