Malicious PDF — malware analysis report

Static analysis result for SHA-256 904bb2f86c6d1e16…

MALICIOUS

PDF

70.5 KB Created: 2021-01-05 05:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daccb37cb50e55845a2db2c6b0754ff6 SHA-1: b73da9abecdec3d4a50a3971aa2f035b6cc10ccf SHA-256: 904bb2f86c6d1e16d91376b796c0c79c537c5136b62f6ea330f51c5c6f8ac83f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'genetics practice problems worksheet answers pdf'. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

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://traffine.ru/aws?utm_term=genetics+practice+problems+worksheet+answers+pdf
    • https://cdn.sqhk.co/wirowanorax/SZogiAm/mepesotus.pdf
    • https://tixurowojon.weebly.com/uploads/1/3/4/7/134704999/6928617.pdf
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/jutixefelivo.pdf
    • https://pikotefomulig.weebly.com/uploads/1/3/4/3/134317367/5358f.pdf
    • https://cdn-cms.f-static.net/uploads/4451227/normal_5faedf3ac2057.pdf
    • https://cdn-cms.f-static.net/uploads/4455198/normal_5fdbbdf1ba6b0.pdf
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/4267426.pdf
    • https://cdn.sqhk.co/ropesuzuruf/y266Sjc/zafobur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a31f7b62-f5f0-4a77-b675-8cedbac40eff/beginners_python_tutorial.pdf
    • https://s3.amazonaws.com/tokatefozude/download_baidu_maps_app_android.pdf
    • https://uploads.strikinglycdn.com/files/cb0ccdd1-354c-431d-a6af-fb7d2bef3431/45771798493.pdf
    • https://s3.amazonaws.com/bezegoluzose/84417915040.pdf
    • https://s3.amazonaws.com/pewebopufupe/netflix_app_android_apk.pdf
    • https://uploads.strikinglycdn.com/files/42626d8b-5b50-4509-8400-3c404b1c6132/537517772.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_off0000d4c5.bin
09912e9da517e906b8b64bf7c9a455ff865075da38557038f2396edb6b755b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 5720 bytes
font_01_sfnt_off0000e823.bin
303029cc1964f1169876a9c87fd299268056587d3821990dd06d9e68fb2e743a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 10788 bytes

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