Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2879deab476407c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-22 00:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 314371014c757c6e024c7a0a2d822b46 SHA-1: 2cc654a5a1b3bffd0ef165c6b7a927179291f2cd SHA-256: c2879deab476407c4f0ca32199819c1eccdd4d2381db1f6d242f5b42804d477e
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to setting time and date on a G-Shock watch, likely to direct users to the malicious URL for a phishing or malware download attempt. No scripts were extracted, but the presence of multiple external URIs and the overall heuristics point to a phishing or credential harvesting attack.

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/strik?utm_term=how+to+set+time+and+date+on+g+shock+5081
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe82cbbdd6b2.pdf
    • https://cdn-cms.f-static.net/uploads/4426090/normal_6048a54742b31.pdf
    • https://cdn-cms.f-static.net/uploads/4448720/normal_600ff784bb411.pdf
    • https://ximepovefuvaxoj.weebly.com/uploads/1/3/1/8/131856443/xenebijip.pdf
    • https://cdn-cms.f-static.net/uploads/4475729/normal_6046366d7c15a.pdf
    • https://cdn-cms.f-static.net/uploads/4444357/normal_604771abb8f02.pdf
    • https://nizodori.weebly.com/uploads/1/3/4/0/134000204/wuxiraxevorare_vimisa_dexijuwavaga.pdf
    • http://donbetosstreettacos.com/wheel_of_fortune_game_online_cheatsbay0t.pdf
    • http://akmurzina.com/icamera_1000_setupbxrqd.pdf
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/vebirumewujagix.pdf
    • http://moresukko.ru/jogemoxazarepilerumogidanw0ogr.pdf
    • http://jamotovoxut.mywebcommunity.org/16782070093.pdf
    • http://freefire-gifts.com/ruwisoxaxokofisawa4i2dh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dasobiviwadodaj.atwebpages.com/lsa_international_internships.pdf
    • https://uploads.strikinglycdn.com/files/d8dbecec-93e9-41be-badd-48b700fc2b83/japad.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_d1c9fbab59c249aa917f13f9c402f02e.pdf?index=true
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_9fdb295ddc5440f38e0fc5653584927f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39b53d58-4b94-4268-a7d2-00fc5ac5318f/how_do_you_reset_a_kenwood_stereo.pdf
    • https://uploads.strikinglycdn.com/files/9cd90e98-6d5c-4407-b904-353d301e834f/35151325014.pdf
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_275577f4576a436ca94253b62719c90d.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_off0000e1b4.bin
8406c2fb5c0f97c21cfb5d5efbaaceec61b3537506775e828ef48600a0d11364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 5852 bytes
font_01_sfnt_off0000f595.bin
79c96119a41a800f35cd21b41e8fbfa94e3fe15b1e4e3a6a35ae8fb9176ee7b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10344 bytes

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