Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb89146b810f2589…

MALICIOUS

PDF

67.1 KB Created: 2020-12-23 00:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3a8876ffb3f3999a65a81454a1dcf7 SHA-1: d9a4a1b4535b7f7c599377e032d456114fc7bfac SHA-256: bb89146b810f25894d1b987eff0e926d49cc939901f30a5b67179d42b1806dc2
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains and potentially malicious hosting, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of multiple external URIs suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=mass+alimony+calculator+worksheet
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/6099268.pdf
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/gekumugifa.pdf
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/semebesedux-kafefef-xafevob.pdf
    • https://cdn-cms.f-static.net/uploads/4386613/normal_5fd964018f61b.pdf
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5f9d55198bd22.pdf
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/roronositofasu-kajareburawor-xujafaku.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fb60ecb2ded1.pdf
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/nopalejojo_tidafitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3b9215a-8660-4db7-b4da-437d0240553a/leradagijuwududuti.pdf
    • https://static1.squarespace.com/static/5fc4e4d1ea4a794d565eb1ca/t/5fc815dbb0f45b2a3d172dc4/1606948316650/t_mobile_prepaid_plan_login.pdf
    • https://uploads.strikinglycdn.com/files/941cd016-48a9-45b9-9383-f91b40d48636/16451808809.pdf
    • https://s3.amazonaws.com/debiwelof/fresno_nightcrawler_merch.pdf
    • https://s3.amazonaws.com/lowuwofuxali/wapotazaxeda.pdf
    • https://s3.amazonaws.com/tonemakopinibem/active_learning_methods.pdf
    • https://static1.squarespace.com/static/5fde968fd548586ddd28100e/t/5fdec25391828d0f5d4eb33c/1608434260196/aditya_hrudayam_in_telugu_song_free.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_off0000cbd9.bin
e60f22c1d857082dfa64c657ccefd6c19df27f2d5a3ce5f7c6f5261a92aabf01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 5304 bytes
font_01_sfnt_off0000ddd5.bin
b60bdfc2d9c7ac5b1b7bbe09f07cbabe6b15c2e3124b678690b6d2fd44cabca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 9844 bytes

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