Malicious PDF — malware analysis report

Static analysis result for SHA-256 a148c72f5491454b…

MALICIOUS

PDF

88.3 KB Created: 2021-04-17 00:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c43b2fb01a4cfdcd1b6695cf0694ce9 SHA-1: 2cf99cfd3906b64816a9f638a9542f1bab976cb9 SHA-256: a148c72f5491454b71398f6dd6a531f8b090ddc0964499efceacefc3eba8cd5f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, with 'http://wersita.space/90098078992z0w3z.pdf' being a prominent example. The embedded URL 'https://vilenefex.ru/strik?utm_term=six+nimmt+english+rules' further supports the attack pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=six+nimmt+english+rules
    • http://wersita.space/90098078992z0w3z.pdf
    • https://cdn.sqhk.co/vixukose/iJDgihb/14612663253.pdf
    • http://gnoogle.site/xutigususiliwuvokefcqo.pdf
    • https://cdn.sqhk.co/liripudeb/LP3qhbp/jolovabofobebesu.pdf
    • http://mandarin-fruit.space/67004196205gwdob.pdf
    • https://cdn.sqhk.co/juzurupivepo/fgpJXZC/mobizen_mirroring_for_pc_free_download.pdf
    • https://cdn.sqhk.co/vesagivara/DHugdij/28204283152.pdf
    • http://lestyprin.online/what_spider_can_kill_an_elephantx3rbg.pdf
    • https://cdn.sqhk.co/rubutemoxe/jchgVge/bodileterakuwiriwunebis.pdf
    • http://help-lnstagram-verifycopyrgiht.com/what_are_the_questions_asked_in_interview_for_excelongn7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_881a4a089c1f4132a4f7557781cd45bf.pdf?index=true
    • https://s3.amazonaws.com/boxujetanonikuv/10248347119.pdf
    • https://s3.amazonaws.com/desenaz/worksheet_inscribed_angles_and_arcs.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/42250814760.pdf
    • https://s3.amazonaws.com/timituvupame/bhoot_studio_fusionbd.pdf
    • https://s3.amazonaws.com/nagev/jagig.pdf
    • http://tidovagupuwosep.rf.gd/bronchiolite_virale.pdf
    • https://s3.amazonaws.com/sitok/troy-bilt_tb110_engine_owners_manual.pdf
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_ab08c9dfbd7e4ac69c000c473b7f0f28.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_0f0ccad742204c4980bf88044a5bf573.pdf?index=true
    • https://s3.amazonaws.com/fomudebipefasu/wobotavapidizafupi.pdf
    • https://s3.amazonaws.com/vukusa/girilakemapasez.pdf
    • https://s3.amazonaws.com/sakaburepagase/where_is_free_willy_3_filmed.pdf
    • https://s3.amazonaws.com/fasomusogapovi/calendar_2019_week_number.pdf
    • http://pevutedijubixit.epizy.com/how_to_reset_frigidaire_affinity_electric_dryer.pdf
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_1d27c5842e164737926ebac7b81ee245.pdf?index=true
    • http://rudufegasavu.rf.gd/sole_proprietor_operating_agreement_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f5.bin
6737fe92308d70a508035da8246e6e5acb3948329baf05e7e77c411a4e5bdb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 4232 bytes
font_01_sfnt_off00010fe0.bin
2eda0ad7d0dc44c47d1c1e80312484bf1449ab6f171249e39fd2d41ee1164930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 4832 bytes
font_02_sfnt_off00012018.bin
122c29d541d17870ad932e9ee778542984c6f9c034e7453aab3d868a14012008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 10640 bytes
font_03_sfnt_off00014498.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14498 4324 bytes

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