Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a84e71537621b7d…

MALICIOUS

PDF

80.2 KB Created: 2021-03-12 00:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f3d644e6a1f89aaeeb2f1fb722a8170d SHA-1: 0ac6be70b9ee1c18170ea03ec217557086568dda SHA-256: 0a84e71537621b7dc17338f1081c2aa0c29323094d1c3bf44d9f2e8bba2c219f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links within seemingly legitimate search result content. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=biochemistry+textbook+by+satyanarayana+pdf PDF link annotation
    • http://bestsaleshopin.xyz/what_is_the_best_free_3d_animation_software_for_beginners3vkg4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_600ecb370591f.pdfIn PDF document text
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/6894633.pdfIn PDF document text
    • http://kinoxca.xyz/tivimanxhv71.pdfIn PDF document text
    • http://prizinsta365.online/linking_verbs_or_action_verbs_worksheetqxggv.pdfIn PDF document text
    • http://avbox.org/ginajelitafuwawapojaq6ck0.pdfIn PDF document text
    • http://remontvorot24.com/nusoledusuwepekerivubue6gkb.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/ninemekipusorixovufunino.pdfIn PDF document text
    • http://copyrightnotice-ig.com/bluetooth_handsfree_audio_driver_windows_7_dell48xj2.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/canon_pixma_mx922_ink_walmart.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/085c04f58bdbdb0.pdfIn PDF document text
    • https://pununoruvok.weebly.com/uploads/1/3/4/6/134693134/vinejegiv.pdfIn PDF document text
    • http://classkaod.ru/watch_devil_wears_prada_online_with_english_subtitlesm8hn4.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/tadulojaje-bobedozukiwev-bulugezagufi.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/john_grisham_books_in_order_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_6027adbb5065c.pdfIn PDF document text
    • http://omynutural.space/engadget_rss_feed_urloh0jj.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/mesoperegojukepalajuxi.pdfIn PDF document text
    • https://wawaxotev.weebly.com/uploads/1/3/4/3/134368025/wowofokurutagime.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/zunaporam/borotifafozozure.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/60082005226.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/fluoro_guided_hip_injection_technique.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 5784 bytes
SHA-256: c1ac1f74ebd0e0ebeb232879aa0559edfabc4731a19b74d30b3f02916deb5d39
font_01_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 10772 bytes
SHA-256: a879867540371a9e79a4ac0477b498b6ba743c5b33fabe63374858e43679d9e7

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