Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c4fbed8c5f7e1e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-11 20:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 68dadbe2ca6159715894f54266294dc8 SHA-1: 4203498937ebbcb2b88272fdaff297becc8a9070 SHA-256: f3c4fbed8c5f7e1ec2a696ebb8cb04621c86374b2b532f65e2a2c6f432d07dc9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/strik?utm_term=financial+modelling+unisa+pdf PDF link annotation
    • http://kigazuvunawolux.iblogger.org/batman_pumpkin_carving_templates.pdfIn PDF document text
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/eb27822cd.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/5089850.pdfIn PDF document text
    • https://zopizegojuv.weebly.com/uploads/1/3/1/3/131380511/joguba.pdfIn PDF document text
    • http://sezunerop.iblogger.org/does_anyone_die_in_crooked_kingdom.pdfIn PDF document text
    • http://damikozukigalow.22web.org/rejuxuxuditivale.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/sowejokatuwoka_tijaxugon.pdfIn PDF document text
    • http://uscarins.info/rikelezabuzabevuwn5hp.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/rogefepelobov7hib.pdfIn PDF document text
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/2363518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feseni/benesaderodejagif.pdfIn PDF document text
    • http://resifukizuve.rf.gd/alto_saxophone_sheet_music.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_ebe7a87afbc74c1db3c3b69a983381d1.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_4d3d621e115f4716a094f2c9ef98bc86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/osrs_bandos_guide_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105d5c0a-08ad-47f4-8992-0e63b7823c13/mixuzofufefovenad.pdfIn PDF document text
    • https://00741ec3-e410-48a0-841c-9d69f68d82f8.filesusr.com/ugd/7a11b0_73b1b9d30aec4fc4927317d106c4b075.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95249cb3-6674-4f2e-b87e-0fed0c9919a3/zivogaxibux.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_31e446cbd13447a2a3b6cac8939df573.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_be9f0c49adf346c7a290aec5c813d02b.pdf?index=trueIn PDF document text
    • http://xemozof.epizy.com/furebajijop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45fa1d2-986c-4933-a419-ecb5e48a16b8/what_is_a_global_management_consulting_firm.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/codependency_no_more_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/71265555084.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/zovumevanujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a94649-8409-418e-8b95-c7097e9847f4/15922425694.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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5332 bytes
SHA-256: 92b3c9b6b2cfb974ad7761a1f2302e0f9153c097ec527f045dced650c14dec1b
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10332 bytes
SHA-256: 36f9f55de7980ffd1213631c78de4e32cf799ecb1f0795f05e3baa3e4d00e5da