Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f15b02a54eb977…

MALICIOUS

PDF

75.6 KB Created: 2020-11-10 12:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9738faf010836cffa836956294350171 SHA-1: 624d05afd26e75c78def63c9ea665a9495b72037 SHA-256: 57f15b02a54eb97781c0edc5fef19f972ac49971db98b9b0803420af6baa05b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a large number of external links, including one identified as part of a link farm, suggests a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/aws?keyword=participial+phrase+worksheet PDF link annotation
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/motimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f8aefd4eb711.pdfIn PDF document text
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/c13f1f9.pdfIn PDF document text
    • https://zunobogodosi.weebly.com/uploads/1/3/4/6/134630435/zujobutobolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8c70f98f41f.pdfIn PDF document text
    • https://fowaluta.weebly.com/uploads/1/3/4/4/134488886/22531cb.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://uploads.strikinglycdn.com/files/e1531d38-ef29-45ec-926b-17fdeb3298a9/king_street_primary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f843a9c-0b13-47b3-87f8-63a479021ca2/limite_d_lasticit_acier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80b0bb2-aea9-41dc-91c8-6b0d8b9c3db5/tarigimubozagafeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cccde0-b244-418d-8959-1656962bccce/rekarexizugadej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e18a11-1b65-48d5-93a8-78ddf44b4272/20_road_runner_cartoon_download_mp4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC95 4860 bytes
SHA-256: 77a9bccd55edf99f29231d7f5e3060e8470a6e1ba2420bb92270b75a6d31cc5d
font_01_sfnt_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10352 bytes
SHA-256: e204b8d52d1245ef11cb330378e01dddb3b53020466db02098e15671ecdc892b
font_02_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 20956 bytes
SHA-256: 134c6f20e31cf95d9ff875f682c4ce53f91167203a093bcb62dfb7fa08fb51e7
font_03_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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