Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff66b5385a7487f…

MALICIOUS

PDF

88.2 KB Created: 2021-03-24 17:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b36e33a9641e2c3e1eb1eff3506648f SHA-1: 8ed48302e422913330f4e64cc3ece225779147f1 SHA-256: fff66b5385a7487f88e5bbc7e85cee183215bc33620a59a21e302a9a244c8d45
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs, such as 'https://resalured.ru/wix?keyword=sport+mp3+fm+headphones+user+manual', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is weaponized.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=sport+mp3+fm+headphones+user+manual
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/tenuf.pdf
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/5368463.pdf
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/gaxumakepoke-muvavuru.pdf
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/8927626.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff98f966b6ca.pdf
    • https://lipefevek.weebly.com/uploads/1/3/1/6/131606222/449a0d1f.pdf
    • https://robesiladobaluj.weebly.com/uploads/1/3/0/8/130813577/6445537.pdf
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/tuzilufeja.pdf
    • https://cdn.sqhk.co/nufesewepi/ciaV0Im/free_stuff_near_me_on_my_birthday.pdf
    • https://cdn-cms.f-static.net/uploads/4446151/normal_602924e79e873.pdf
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/xenakesadelibika.pdf
    • https://cdn.sqhk.co/duxadikoti/f8qAmhj/disovu.pdf
    • https://cdn.sqhk.co/tipesewete/jiwz6jd/rowozepimaxowasifedok.pdf
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/jojafiniwajex_sosowuk.pdf
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/majarijopo_luvipef_pipiraf_jefezasisol.pdf
    • https://pobanuti.weebly.com/uploads/1/3/1/4/131437932/04c35515f27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/potamotaz/29662714255.pdf
    • https://s3.amazonaws.com/nemafu/dibepige.pdf
    • https://s3.amazonaws.com/baposivarabuj/christmas_carols_youtube_playlist.pdf
    • https://s3.amazonaws.com/rovikibixu/types_of_buffer_system.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_off000119b8.bin
e381de924a9c4faf60ac252649254ff855f77d0a82efaa6cfb2da1d784d2cb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 5548 bytes
font_01_sfnt_off00012c66.bin
f462e78b5d16d73a8ae25b683852f42481d070a71fee8d81e5944dfc0bb590cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 11988 bytes

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