Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d405301140cbed…

MALICIOUS

PDF

70.6 KB Created: 2020-11-27 09:38:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6b5d7c0fe67cb5e7c1335c51674b59da SHA-1: 170bfdf00fc536585911687cc422e1b6b22ed426 SHA-256: 64d405301140cbed4d530db9bbd3fff79a8d83587b732df6b5fb8235a43a7e93
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs, including one pointing to 'traffset.ru', indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=94+answers+types+of+flowers PDF link annotation
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/689284.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/fawerodotexu_lerisizife_fimuvovujese_bemorosaku.pdfIn PDF document text
    • https://gakupimofol.weebly.com/uploads/1/3/4/5/134583622/4125052.pdfIn PDF document text
    • https://rajulotopeza.weebly.com/uploads/1/3/4/6/134665566/0a29f1d56.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/0e45a5.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/6377884.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/fasanag/printable_birthing_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/69863294988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf185281-01d1-4556-8de0-d9ef26457d24/imagenes_de_goku_para_pintar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929c0336-98a2-49ec-96d0-370b05b2f158/xivepizafadetuwilewu.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/earn_to_die_2012_part_2_unblocked_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8c0bed-a09f-4847-b3e4-52ca789b576d/watch_mission_impossible_rogue_natio.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/buddy_malayalam_movie_songs_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 5236 bytes
SHA-256: 8645183fae9d9bf6c218223959fb86b536e8eb8739c080c90e12deedb372f640
font_01_sfnt_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 10864 bytes
SHA-256: 31affb42e65bee0a0e3e7c5fc7578a6ca3b5af2be8718061e4053e90bc343102
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826

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