Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d84d85a3038d460…

MALICIOUS

PDF

82.6 KB Created: 2021-01-10 02:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 222608618457f0e534ccff7d32eeb277 SHA-1: 25bcde66f9b75933ed3412036631fdf48495dfa4 SHA-256: 8d84d85a3038d46016965ddc20d313799517315730674d03ecd6f96a2b2183f0
126 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 ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or link farms, indicating a likely attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/aws?utm_term=nice+guidelines+childhood+pneumonia PDF link annotation
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/7043771.pdfIn PDF document text
    • https://site-1229024.mozfiles.com/files/1229024/47091452485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fd1ee2b17f6a.pdfIn PDF document text
    • https://site-1172340.mozfiles.com/files/1172340/10548292682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fdb0290c69a0.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/alpha_helix_beta_sheet_structure.pdfIn PDF document text
    • https://site-1178798.mozfiles.com/files/1178798/moving_earth_live_wallpaper_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464065/normal_5fdf53f356007.pdfIn PDF document text
    • https://site-1168148.mozfiles.com/files/1168148/action_for_2-_4_players_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5fe9f5e79a19a.pdfIn PDF document text
    • https://site-1174180.mozfiles.com/files/1174180/strawberry_fruit_tea_with_boba_calories.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/waxegatulo/python_datetime_parse_format.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 5360 bytes
SHA-256: 050983ab12f5ced58149ea1a4d05c1f70bee04c95b1479132ba62b2c0861071b
font_01_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 11628 bytes
SHA-256: ca2d9b612843045037247635e1275c511cfd9f0b9aec091d4e9b1eccc7185200

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