Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1859b7745f7dbee…

MALICIOUS

PDF

78.4 KB Created: 2021-03-14 01:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2e9fb2022293aa574ef62f11651df750 SHA-1: 6a3b17d3042308e6b9b4e3e3d63911c47a623eb3 SHA-256: c1859b7745f7dbee722a1528049fe3ba36b0ff7bd78c435b589f0b9aee3947b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary suspicious URL being https://golowaki.ru/123?utm_term=sheets+of+plastic+cardboard. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://golowaki.ru/123?utm_term=sheets+of+plastic+cardboard PDF link annotation
    • https://cdn.sqhk.co/jufenakajo/MUp9mja/3d_printed_batarang_template.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/2677052.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/d3627a9a00.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/gcsgfB8/pamunipirevomiluti.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/aqhfLur/funufutoruk.pdfIn PDF document text
    • https://cdn.sqhk.co/vekepafate/fmcijif/wejewulefu.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/jhnicgj/la_pro_concealer_shade_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_dfd99ab99fa84d378453b00c3866c2ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/77325721798.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/cdl_trucking_school_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/modern_orthodox_haggadah.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_45d7707cce1a4b9aaa7622d558c1d551.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/48743369914.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_da44f4227a894ef5bddd0d2172927769.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/everyday_use_theme_and_evidence.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/41730056802.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/my_passport_ultra_manual_svenska.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/sp_racing_f3_evo_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/cbse_english_question_paper_format_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/40037917949.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/89708229107.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/zazimuwepakixinek.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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 5488 bytes
SHA-256: a97ebedc47f2c91e98fa4c67c68b1e085b9b5e63bffe3f18e0f0509569a877ac
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 10480 bytes
SHA-256: 3ae759e7af4311ef6424045cb11bb7a1970295d958b1e2aa3bc094803cc6c2b6

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