Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c1e313a391870a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 16:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3589a146d7c250a567b958f3986f8edc SHA-1: 9e11024943d26c721a8ac254f597bd1196789089 SHA-256: c1c1e313a391870ab0b2e1c0578fad5e0e712936d4ca0ed35bdd7a4a6c0b9a2a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, forming a link farm, with a primary URL pointing to a suspicious domain. The presence of numerous PDF links suggests an attempt to direct users to a network of SEO-optimized content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=aerisi+kalinoth+fight
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/8515342.pdf
    • http://muzomabavima.medianewsonline.com/11613265612.pdf
    • https://cdn-cms.f-static.net/uploads/4374362/normal_6039d8423fd5b.pdf
    • https://cdn.sqhk.co/rijatazuga/cnhghaQ/rapodosajumut.pdf
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/3165781.pdf
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5ff859a230567.pdf
    • https://cdn.sqhk.co/tomubozes/hbDjbWw/ridebolodexawedikodelepi.pdf
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/lebaf_nobonas_nazixezomejo_kadolusilopofu.pdf
    • https://cdn.sqhk.co/paxepedamaxa/ExgeggN/61649060647.pdf
    • http://zovolexune.sportsontheweb.net/add_text_to_adobe_acrobat_reader.pdf
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5fdf500470d45.pdf
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/napobomajelorisoxos.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_6055961abdbca.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/7b62c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ea7ae413-3ed9-4d27-ae36-f6be879dc053/volume_of_rectangular_prisms_worksheets_answers.pdf
    • https://uploads.strikinglycdn.com/files/2d8dc8fd-88e0-4b65-97f2-fa042c73b336/36989828833.pdf
    • https://1d20f49f-ccd6-4d05-b9af-9ecc574be1a3.filesusr.com/ugd/7b50d7_9f0df597f5a24b34afcb8bcb869acdb4.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_726849f84b014222811da9e403164771.pdf?index=true
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_97636d982e06481eaa494ffd29718689.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_657dec8c3d0545a5b2373dc5778d72fc.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_off0000ec35.bin
ef511e1ea5b28b675aa31051dadb5603dc9c890bbd64ec1842b243659c9ab232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 5084 bytes
font_01_sfnt_off0000fd80.bin
4af2b6c2b595ae5ddbc4c6a2637ffda4a9b3609fdcd94a7a752c06c031f10b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 11000 bytes

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