Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba32f22cc7ca880…

MALICIOUS

PDF

103.2 KB Created: 2021-05-06 08:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3dd45be1c6ec456a68686a89bb4e066 SHA-1: 5a559722ae2c141e8eef4fabfa1b7c706b49e4ee SHA-256: 1ba32f22cc7ca880f444d500f72b9769865c83a3b99e94965862c7131092a93d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a lure for 'acer laptop deals cyber monday'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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://xezojetit.ru/strik?utm_term=acer+laptop+deals+cyber+monday
    • https://cdn.sqhk.co/tibakekavero/HdgdgfU/helicopter_parents_defined.pdf
    • https://cdn.sqhk.co/ripigopes/Mjjq3zD/crayon_shin_chan_movie_9.pdf
    • https://cdn.sqhk.co/nadipozow/qhbSFwK/ben_and_holly_s_little_kingdom_coloring.pdf
    • https://cdn.sqhk.co/wixefawoz/ig9gdgh/tnt_run_minecraft_servers_pe.pdf
    • https://cdn.sqhk.co/dexujagafir/bNHuhht/nujilamazudamomawez.pdf
    • https://cdn.sqhk.co/midijanere/igdjjhi/underworld_the_shelter_apk_mod.pdf
    • http://sebekeruxa.iblogger.org/lijixoduxofopazelituzi.pdf
    • https://cdn.sqhk.co/towafeniruje/EnpgdVt/67292150969.pdf
    • https://cdn.sqhk.co/labifikup/bhcWwhc/7635406752.pdf
    • https://cdn.sqhk.co/zijigemeworu/IQhhhg2/judetipewegorit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_f6bb839879804dcc916e20156be5faa4.pdf?index=true
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_2557041261474e048ccbcd1b402d28de.pdf?index=true
    • http://ruxuvejefo.epizy.com/11761804632.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_f51296a968ed4bd2af366f95695b44a3.pdf?index=true
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_ff6add70ab86435b86babb7f6c510528.pdf?index=true
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_d41c4d04b3314d1d95144b8e56b82703.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_17cdda85d2494809a9309c5475018717.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8f60d0ca19f84955b9405a611333c374.pdf?index=true
    • 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_off00015622.bin
0804d120d8fcb9f678325fedcb80605f52fb27e30deeb35f3a28fa3555f1dec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15622 5452 bytes
font_01_sfnt_off00016895.bin
16f2d2cc19e2a15542d4029f7b4ca8cb6cf09d577a3a26ef63517fd5b46d942e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16895 11572 bytes

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