Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d102a356ecc9ea4…

MALICIOUS

PDF

75.6 KB Created: 2021-04-24 11:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bfe511f9bc65384dfdb1dc07c9502f35 SHA-1: 2520ca8e2ae8c25ed469a6b80cc7c45dfde82a34 SHA-256: 0d102a356ecc9ea4e3810b672ab410078432c10925b826a05acdaec7cef1c61e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files and URLs. One notable URL is 'https://druttle.ru/strik?utm_term=skyrim+special+edition+how+to+level+smithing+fast', which is presented in a way that suggests it's related to game information but is likely a lure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/strik?utm_term=skyrim+special+edition+how+to+level+smithing+fast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388620/normal_60510a036c32b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5ff952d31d8b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fd79c96648cf.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/falafunu.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/cuet_admission_circular_2020_19.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/98258828286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415052/normal_600759b8431af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/kojefup.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_2eaf25b09333446f89b7306702cef8e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/rowenta_steamer_1550w_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/senuwaregudoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/lg_vn170_sim_card.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_e4a83d1217e04955a041dde0d1598fdd.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_f43774022d4343e38638954ae9cae33a.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_6d05b0b6e2a9413fb90092d0bc0c54e5.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_39c97838d0534c7dac0e0e092e841799.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/53095540239.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5988 bytes
SHA-256: bcde5a5f5d1c5914cad268f0b53a811b5078a423d6250143383774bfaa67e238
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10968 bytes
SHA-256: acbf00f59863b05ad00942a575834072475a8d1dc5e83008b582c92ee6273aeb

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