Malicious PDF — malware analysis report

Static analysis result for SHA-256 595b1a0b7fe8e1e6…

MALICIOUS

PDF

70.5 KB Created: 2021-03-14 22:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b53739460069dfaef942e7a3f358e71 SHA-1: ed0b06e47236fed66c44e9e680e2819c3ade3ece SHA-256: 595b1a0b7fe8e1e69b877ff6d5a41f821aa457685c23f2632bb58e6a0864cf19
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site designed to mimic search results for a specific keyword, likely to trick users into clicking through. The presence of external URIs and the overall structure suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=death+stranding+legend+of+legends+time+sensitive
    • http://fullpisetc.ru/should_i_answer_unknown_numbersfqrsu.pdf
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fdc5da6a4bf3.pdf
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5fff473ebc000.pdf
    • https://cdn.sqhk.co/gobisurav/hjgj0hf/guess_new_movie_name_with_emoji_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5ffc6f3b2818c.pdf
    • http://sunny-web.ru/how_to_set_up_tp_link_wifi_av500hrmpg.pdf
    • http://newipufisatag.scienceontheweb.net/how_to_charge_your_jlab_wireless_earbuds.pdf
    • http://thefortykuti.com/pictograph_worksheets_for_grade_1_fizfz4h.pdf
    • https://cdn.sqhk.co/vefoxewijuja/eFn1heK/offline_rpg_games_android_free.pdf
    • https://cdn.sqhk.co/kososojog/hcgelk0/34589249065.pdf
    • https://cdn-cms.f-static.net/uploads/4464056/normal_601dc04701c64.pdf
    • http://kunepuvobimamin.medianewsonline.com/how_to_import_java_swing_project_in_eclipse.pdf
    • http://lunatan.medianewsonline.com/givatugawuba.pdf
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5fe0f4341b4b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kagedatabujo/4618780266.pdf
    • https://s3.amazonaws.com/likerajatob/barnett_quad_400_string_length.pdf
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_173b85aa3aa34e44b70620992ea20696.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_496e09613dac4a54b40bd2e165bfeaed.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_a0f19a33cd254ab88c746af9a4d962d9.pdf?index=true
    • 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_off0000d4cd.bin
f7c83e2f22c0aff74a39ef6f6f73effd7b04aa21e48473d27bba0353219a73d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 5380 bytes
font_01_sfnt_off0000e6fb.bin
080eb64598fc4bda9a19a0adf371632309cb0a52ef46d0f3958f6bd36520d962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 10468 bytes

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