Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca3aee56c49055…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 06:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1511e05d74b3b19d457c5c3fc83b4b1e SHA-1: 7bd8d7b035e4a84c567d8d254d5eb33ec3fcfd17 SHA-256: bfca3aee56c4905574dc0e6f179f6e4a1c9667eca5b7ab33d9853e1097684c7c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO link farms or phishing campaigns. The embedded content, though heavily obfuscated, appears to be a lure related to a search query. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=what+is+the+funniest+city+name+in+us
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/tufiru.pdf
    • http://helper-badges.com/school_life_simulator_2_apk_downloadggbt3.pdf
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5ffda683a1664.pdf
    • http://copyrights-notices-helps.com/jemabelikuvovamotuxigomine5w.pdf
    • https://cdn-cms.f-static.net/uploads/4415300/normal_60131d6a977d9.pdf
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/wadogedijezavifasog.pdf
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/tokoguriz.pdf
    • http://matteset-spon.space/mokagixepefaxo8m.pdf
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/mosulowe.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6014e3b691259.pdf
    • https://cdn-cms.f-static.net/uploads/4467601/normal_600ae000b0cd5.pdf
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/movovezavafubalitixa.pdf
    • https://cdn-cms.f-static.net/uploads/4394072/normal_604fbb2887218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kagedatabujo/math_worksheets_grade_4.pdf
    • https://s3.amazonaws.com/jesidofefe/5777711045.pdf
    • https://s3.amazonaws.com/tokudapele/28704515132.pdf
    • https://s3.amazonaws.com/xulepiwa/how_to_provide_cognitive_behavioral_therapy.pdf
    • https://s3.amazonaws.com/jebokizez/amazon_android_app_store_apk.pdf
    • https://s3.amazonaws.com/tolivajupeku/17879088766.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_0a4773b4bac84224b0c14a2c3d347b55.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_cb85c3692c16451ea64ada8e4a896c25.pdf?index=true
    • https://s3.amazonaws.com/saxefi/2473472021.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_eaf2a9454e9644a4a653162982a1cea9.pdf?index=true
    • https://s3.amazonaws.com/zevutebulaworel/sogol.pdf
    • https://s3.amazonaws.com/suxiweke/grid_template_repeat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff2a.bin
6c97bfa0c2c031e23339dd75b896d04870218dbff92f5792beda2d50da57f4b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 5108 bytes
font_01_sfnt_off0001107e.bin
a6930364c3669c14d7b94aa916025be2705c085f2dff3903f026eed2351f7926
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 11608 bytes