Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cbaeec71a8f49c…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 21:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50144f3b84c083dc03381ff9e295908c SHA-1: 90e36e963684928798760d592806d03e4d895fc2 SHA-256: 15cbaeec71a8f49c591c94eede7d06d73e019a5d88bfdbfd5f7d9dbb9135f0b3
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, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=temperature+sensor+questions+and+answers
    • https://kamubopo.weebly.com/uploads/1/3/4/6/134631829/31155.pdf
    • https://gopiwalugase.weebly.com/uploads/1/3/0/7/130738825/3777012.pdf
    • http://nosixavol.sportsontheweb.net/valentine_one_radar_detector_installation.pdf
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/2451126.pdf
    • http://xanejog.medianewsonline.com/74464147575.pdf
    • http://nefutekugurenap.mygamesonline.org/amplifier_project_class_12.pdf
    • http://pivolirarorip.mypressonline.com/17164844354.pdf
    • http://jibakerutev.mypressonline.com/rasedoxiver.pdf
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/kelikamim.pdf
    • http://patajafurep.mywebcommunity.org/31681717770.pdf
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/tufazeto_xazipale_fekevofilunoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_ab36049d5b1045d086095060e10a2045.pdf?index=true
    • https://s3.amazonaws.com/zurovajij/81521815678.pdf
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_029e70699d604335ad4bb9840c4c78ec.pdf?index=true
    • https://s3.amazonaws.com/tetofamuxulil/how_to_use_z_table_in_statistics.pdf
    • http://kakasis.onlinewebshop.net/12497973782.pdf
    • https://s3.amazonaws.com/dagasopones/88094016710.pdf
    • https://s3.amazonaws.com/fizufapu/3868898345.pdf
    • https://s3.amazonaws.com/rupatojuko/atm_card_apply_form.pdf
    • https://s3.amazonaws.com/zidenigad/29727538478.pdf
    • http://nobapizasiwe.myartsonline.com/67852241907.pdf
    • https://s3.amazonaws.com/vudivuzakal/17878151011.pdf
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_586a29ec20004e50824fbc6d3bc94939.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_3cae2f67126541148066753b5a1b27ab.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_off0000fcb8.bin
63c3bc11a1621bac6b866091c201bf4a6a5c30c84e46a1d8e73e3ba9643a44bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 5240 bytes
font_01_sfnt_off00010e77.bin
2fda461afaec714a52c50b58379292e331396c799a42add4fbcfadf43d65aff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 11528 bytes

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