Malicious PDF — malware analysis report

Static analysis result for SHA-256 81feb02a55876250…

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 14:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 27a129665eda945ebb185fb21fc95810 SHA-1: 8c6f36f05cea6aca51caebc2ce0f230c2a0539c4 SHA-256: 81feb02a5587625087f5c6768faf2a0eacd7e9be89d038f76477c78402e614ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple external URLs, including those flagged as unknown reputation, suggests the document is designed to redirect users to potentially harmful sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=ideal+protein+diet+meal+plan+phase+1 PDF link annotation
    • http://medtechnika1.ru/corona_render_for_sketchup_freembvfu.pdfIn PDF document text
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/nuwofazored-luporojuja.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/2200285.pdfIn PDF document text
    • http://com-connexion.xyz/lagojuwugimaxj63d7.pdfIn PDF document text
    • https://pivisagut.weebly.com/uploads/1/3/2/8/132815367/361eb6e1e8b952b.pdfIn PDF document text
    • http://flylovel.com/40440229671ydm2v.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/sabogegiduxomi_lufewufaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/fTjfhhm/97762623947.pdfIn PDF document text
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/af5f8edec3.pdfIn PDF document text
    • http://zoom-omsk.ru/bmx_bike_racing_near_mefixu1.pdfIn PDF document text
    • http://bloodcraft.online/kunebezizitexipan16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sikuva/lepununigunoxexerapafer.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/nofajegukavu.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/york_yvaa_chiller_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/kutty_movies_collection_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/lexopugumimolopi.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/lifufixerovubenigiselupen.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/age_of_empires_2_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/24732514899.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/74102530815.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/consumer_reports_overactive_bladder_drugs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 4976 bytes
SHA-256: 47a1033cd7bf418a08a4502dd14ded60a68e9743f2c5c96d5337a1c66933fc1f
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10408 bytes
SHA-256: 3b7099b90b8bed43941244bc8fd454277173144b2b02159d81b88356f8004ffc
font_02_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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