Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7cd672cb974b37…

MALICIOUS

PDF

84.5 KB Created: 2021-05-16 05:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: efeea53f013156368d06afd7f0352107 SHA-1: cd55080c097d1865c1fd1a8d6036a47137a78ee5 SHA-256: 8c7cd672cb974b37bf8406befc682ba056ce092be51878cc392f5628fb0ee488
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=survival+gear+catalog+request PDF link annotation
    • http://covid-19online.site/zigomufen6twpm.pdfIn PDF document text
    • http://hiziryigit.online/738246741221yezk.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/F2Ijch0/politics_and_prose_cafe_dc.pdfIn PDF document text
    • http://damita.fun/9931697022iwame.pdfIn PDF document text
    • http://viewcreditscore.info/peligumogdnj4.pdfIn PDF document text
    • http://thechambre.xyz/how_do_i_love_thee_elizabeth_barrett_browning_wikipediaeis6x.pdfIn PDF document text
    • http://bioforcecolumbia.site/who_invented_the_internet_cernzes7f.pdfIn PDF document text
    • http://pedron.fun/66333586926uzkvw.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/boraxusoxasufudadazokofifvt3o4.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/4ibibid/linear_regression_python_from_scratch.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/gowebabuxogiro/43673587831.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/fularelidokokovizenuni.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/echo_weed_eater_string_wont_stay_in.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/nafunilatenuduni.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1b885aa3f0a94ebf8f9e542c4bb2e9f9.pdf?index=trueIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_dd4ce3cab0374f7a9edadfdddbf3bcb3.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_aef1572b884244759565eba148e261c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulujono/12228862758.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/mawabonomu.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/frasers_centrepoint_trust_sustainability_report.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_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 5256 bytes
SHA-256: a2b536a8976f71815237faa1a76ea0cd1c7efd1922a2a86ad71c37e809cd1c99
font_01_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 10344 bytes
SHA-256: 2437e21f7ad448af3f73991833af211d95695475a14e1444e5cd8603c040c6c7

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