Malicious PDF — malware analysis report

Static analysis result for SHA-256 083316763aea8c4b…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 02:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45923c3d10d932bf983ef748279800b1 SHA-1: 3639396ca6e1747932a7b2192bbe3384615710b2 SHA-256: 083316763aea8c4beaa16e507d3d804c12571f376e856e6253904d7271056d90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs point to suspicious domains, likely used to host malicious content or redirect users to phishing 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://nipisod.ru/strik?utm_term=asus+p8z77-v+pro+lga+1155+z77+atx+intel+motherboard
    • https://cdn-cms.f-static.net/uploads/4472484/normal_602074ec46cb9.pdf
    • https://takewozijofu.weebly.com/uploads/1/3/2/6/132682119/karuwevaxo_pojupilavebim_sujiziv.pdf
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5fd1cab81fda5.pdf
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/9983302.pdf
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60162ad6a1478.pdf
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/5637694.pdf
    • https://livurexile.weebly.com/uploads/1/3/2/6/132695833/fukoboko.pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_601b85766626b.pdf
    • http://lovojat.22web.org/algebra_calculation.pdf
    • https://ziwedalonom.weebly.com/uploads/1/3/5/3/135325023/57bb4170774138.pdf
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/430719.pdf
    • https://kinumonitebira.weebly.com/uploads/1/3/4/6/134605003/nafudafesum.pdf
    • http://gikubozudunol.iblogger.org/genie_pro_max_not_closing.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mawekipabotore.epizy.com/87260375957.pdf
    • http://fizuxobitunoge.epizy.com/3dmark_time_spy_directx_12_benchmark.pdf
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_f2b7bb6e533c4492af6e991a8fc8db43.pdf?index=true
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_ff0960e72a4a448ebe20f1b596630665.pdf?index=true
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_ebb0e84018ac4989aa3b80bb75d7f9f5.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_off0000f945.bin
d53a1c1db8602e1bec72d52aff5b01256273373407cd39ce62b201ea3e5718c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 6164 bytes
font_01_sfnt_off00010e3a.bin
9880b4c27079bf240b79f3004c2652bbfec5c49468496345896ee90661688d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 11180 bytes

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