Malicious PDF — malware analysis report

Static analysis result for SHA-256 1271caa7fc3932b3…

MALICIOUS

PDF

85.7 KB Created: 2020-12-24 18:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6de62c1f32902b4fef62067c4a92e458 SHA-1: 7dc90f17696e5ceee2c41805d7da5876885ab945 SHA-256: 1271caa7fc3932b3129390ef5aa25810ac14ba5bae5f5babfe6801edbca43530
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=formule+calcaire+dans+l%2527+eau'. This URL is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=formule+calcaire+dans+l%2527+eau
    • https://cdn-cms.f-static.net/uploads/4425784/normal_5fc166ee23dd9.pdf
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5fa049bb347f3.pdf
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5fc3a8e238c70.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8738ef0d2a3.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/3894559.pdf
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/3507891.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/bovipazijun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rurosaveruk/azatioprina_en_perros.pdf
    • https://uploads.strikinglycdn.com/files/5eb0f4ba-37d4-471f-a25e-9dd6d772ed8f/psu_rec_center_group_x_schedule.pdf
    • https://uploads.strikinglycdn.com/files/8f02f2f4-dbd8-4db5-974b-fecad387f960/fabfitfun_winter_2020_box_spoiler.pdf
    • https://s3.amazonaws.com/lupuvogotog/phenol_chloroform_isoamyl_alcohol_rna.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c4b.bin
f4b1a6f65ec70d8d1f694bf517ae9817c1f95b49a148908c4a48a37525513b91
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 5076 bytes
font_01_sfnt_off00011d7d.bin
8711b5c613e49dd9652f5caf3577bc3523d32fc4dbdb416a10265470ff840927
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 13836 bytes