Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af55e63b7efd182…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 02:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e808558f57ace08010d3bba9cd06d354 SHA-1: 34842538f65c5b87e5c4a83543bd69486ed02c3c SHA-256: 8af55e63b7efd182143cfe98774cf792c51ad544157712aa14b9affc2fb762e7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external URLs is https://golowaki.ru/wix?keyword=output+force+equation, which is likely used to direct users to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=output+force+equation
    • http://lnstgramhelpcopyright.com/para_que_sirve_la_vitamina_b12_500_mcg68eiq.pdf
    • http://dewisazovuvoxi.mywebcommunity.org/the_crystal_bible_1.pdf
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/3477998.pdf
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/4043948.pdf
    • http://detonic-ro.website/83592526160ti0o1.pdf
    • http://lojapidabud.mypressonline.com/how_to_prepare_a_risk_assessment_form.pdf
    • http://ruwufuwetoj.mygamesonline.org/75567313252.pdf
    • http://tapavinologo.mygamesonline.org/nodimetevuzeneluren.pdf
    • http://thedefenseforge.com/ti_nspire_cx_ii_softwarevzjwm.pdf
    • http://all-system7.xyz/kevovotwf4a.pdf
    • http://esportzmlevent.com/presente_passato_prossimo_o_imperfetto_esercizi1nwd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_421798a0b6744db1ab07e0466d3882d9.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_91cc9eb7b7074dacab4897655e1602a3.pdf?index=true
    • https://s3.amazonaws.com/galinikagopit/ravizol.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_4e6e77f8ec1a4d94baae232ee266b66d.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_47dd8867f80642b6867088acb397534b.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_06829f85a9614fd9b18c5f8656309f23.pdf?index=true
    • http://fojosotum.myartsonline.com/21912859133.pdf
    • https://s3.amazonaws.com/lovomijelun/26445225194.pdf
    • https://s3.amazonaws.com/lixuduwonifa/perimeter_worksheets_year_3.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_9d4a12cb9a2b447d95df6d041f774cb8.pdf?index=true
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_60c9132696c1429bba359cd25a668dc4.pdf?index=true
    • https://s3.amazonaws.com/makixibawumebol/wedding_anniversary_video_song_status.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_8ada6b4beec5480cafb7b46aca2c3c5e.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_off000109d0.bin
808e686312b47575bfadfa316281a9587515dd57785896013eef079638968587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 4952 bytes
font_01_sfnt_off00011ac2.bin
8375501618a2ff06651f18786821edbbd2cde1665cb62b92cb0f2dd300056808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 12616 bytes

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