Malicious PDF — malware analysis report

Static analysis result for SHA-256 659d6341449d5d01…

MALICIOUS

PDF

82.4 KB Created: 2021-04-26 12:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fceae8d89002b98a1290464489f3e8dc SHA-1: 96dc6b11a644b2b6d51aac4570e0d66063b2c846 SHA-256: 659d6341449d5d01cd6dbcf71a82655064220fcabb445ad24e478ef134256dc2
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 pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. One of the primary external links is to 'leonvi.ru', which appears to be part of this malicious infrastructure. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=2011+jeep+grand+cherokee+service+air+suspension+immediately
    • https://xevaxeleputoli.weebly.com/uploads/1/3/0/7/130775823/9b9d6bfa.pdf
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/911a9f5d2.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/b98ccde78.pdf
    • http://nupazoz.22web.org/95234794756.pdf
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/fa1b2716f33e.pdf
    • https://lagisarer.weebly.com/uploads/1/3/4/1/134131240/869121d4e.pdf
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/tivararabanepegis.pdf
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/negozokabofipabifa.pdf
    • https://koxufujemugipad.weebly.com/uploads/1/3/0/7/130739729/zolezijawufunomeko.pdf
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/xegefov_nulovopinedipa_kubibufefodoxis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_d31a6619abf24953851bc61c566751e9.pdf?index=true
    • https://s3.amazonaws.com/zafaronivaj/a_touch_of_class_movie_review.pdf
    • http://nozafawuronixe.epizy.com/acr_guidelines_for_radiation_oncology.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_21fbf9151fa8413c88dfe0cd2a62eb35.pdf?index=true
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_6e9398d286784d378d034635136b7314.pdf?index=true
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_bcdabe5f8a89430990271c0d0d71982c.pdf?index=true
    • http://kerojuluped.epizy.com/nowevire.pdf
    • http://xagulog.epizy.com/jaman.pdf
    • http://wosikomalaza.epizy.com/begodijuwesagimub.pdf
    • http://vopepogam.rf.gd/nidivugupap.pdf
    • https://s3.amazonaws.com/limepusotanal/fiddler_on_the_roof_tradition_broadway.pdf
    • https://s3.amazonaws.com/kulinisokakewi/simple_html_templates_with_source_code.pdf
    • http://vinarudafolu.epizy.com/409934902.pdf
    • https://s3.amazonaws.com/nutanigonu/changing_graco_crib_to_toddler_bed.pdf
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_b528ef981dae47e8ad5ac2b9f7341ae2.pdf?index=true
    • http://ronaripijamalon.epizy.com/doc_love_the_system_summary.pdf
    • https://s3.amazonaws.com/neporezofov/manually_win_10_1903.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_off0000ffcd.bin
0de70224487e48cba4730759dda19a73d8d8901637d8128504a331c03a77ea08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 6020 bytes
font_01_sfnt_off0001143c.bin
48acf95e2791061095715f0a5b0a532463bfb394ee7882349433092f80da4add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 11380 bytes

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