Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0e697e2c6b1af6…

MALICIOUS

PDF

82.3 KB Created: 2020-11-26 03:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 68436f6c4183e4066a56bfc235fd530f SHA-1: e16d2b5a23991be333981daba33616070ba65893 SHA-256: 1f0e697e2c6b1af628bfe490e6bee00292822b7c5ebd29763e1a83299501c434
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating it contains a large number of external links. The ML classifier and ClamAV also identified it as malicious. The primary external URL, 'https://trafftec.ru/strik?utm_term=para+q+se+usan+las+comillas', suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafftec.ru/strik?utm_term=para+q+se+usan+las+comillas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489979/normal_5fb5b92d63ffc.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/b8092.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/faruj.pdfIn PDF document text
    • https://zazowabuk.weebly.com/uploads/1/3/4/6/134641257/nesavuza.pdfIn PDF document text
    • https://pazumiwasosum.weebly.com/uploads/1/3/4/8/134892739/vakukasuri-xanekivudoz.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/vukusa/misplaced_and_dangling_modifiers_exercise_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/fertilizacion_del_aguacate_hass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f5a110-b6e5-405d-bb33-0a4f3ee679c0/honey_select_character_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/text_to_speech_online_free_unlimited.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/7115688686.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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 4644 bytes
SHA-256: 4acd449684206a44ad199a69a80d9b07d1909266f7d2158b3008354fc069044f
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5072 bytes
SHA-256: 66ea3276a647c6e2588846108a2abe51f158dd112ddd8df1159136223f44150e
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 12236 bytes
SHA-256: f9a134e64e4011ad8f4790b115e24bdba873076e09215e8c16913ee30a6d8b44
font_03_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16164 bytes
SHA-256: 564630a094b23c7f5e7c0f01d6e07c95eff1b5717badb21da5ad397b3c135906

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