Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78e401f62d74bd9…

MALICIOUS

PDF

85.2 KB Created: 2021-02-22 00:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 35237bfecc575e9adc80fad887c77c3a SHA-1: efa139b3ade52b233079fc69339dffc53386ee92 SHA-256: a78e401f62d74bd9ee8b54029c6d2dae594aa0542c3c5a9a8eba636acc9fcd9b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Monster rap song lyrics', which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=monster+rap+song+lyrics PDF link annotation
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/8743515.pdfIn PDF document text
    • http://islemleriniz.org/best_daf_yomi_mp30mtai.pdfIn PDF document text
    • http://mebelintera.ru/how_many_calories_in_2_cups_of_spring_mix_lettuce2gsqg.pdfIn PDF document text
    • http://nimojojisox.22web.org/40653491126.pdfIn PDF document text
    • http://changepass.online/gavopexasikexin14oc.pdfIn PDF document text
    • http://sallles.ru/nigujelutur8kfjn.pdfIn PDF document text
    • http://potusowo.22web.org/lowikula.pdfIn PDF document text
    • http://vashastrahovka24.ru/good_night_my_sweet_heart_image56icv.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/gilivelepibegazivedofo81z8c.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/14ce47.pdfIn PDF document text
    • http://gelchlen.fun/58287870296q7h76.pdfIn PDF document text
    • http://arm-watch1.club/653494470732usg9.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/0869b.pdfIn PDF document text
    • http://good-production20.site/retro_frog_welliesdsf7v.pdfIn PDF document text
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/6f046886ec342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xisapedugifado.epizy.com/bone_cancer_information_wikipedia.pdfIn PDF document text
    • http://gebaruzowulidus.epizy.com/netflix_pc_apple.pdfIn PDF document text
    • http://jodojan.epizy.com/98381084427.pdfIn PDF document text
    • http://mibozoviken.epizy.com/cheat_droid_app_free.pdfIn PDF document text
    • http://tunawibiga.rf.gd/fowubudezapa.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_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 5208 bytes
SHA-256: a96f04d7cb21f6088afc2a559c99514a770e8a40d10434341e24cba4732cbae7
font_01_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 11000 bytes
SHA-256: 468498bae43f1f8c40a4d84658a3795a01730c40ea31559f6d6f3d27cec0a98b

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