Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7356a7c7386cc0…

MALICIOUS

PDF

103.7 KB Created: 2021-04-07 14:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6c329775a7d9c27d04e542f22ab6c2fb SHA-1: d36ac65b900a18154800b5afacf904ff61ca1938 SHA-256: fa7356a7c7386cc0833a1f73e6bfaa75a400060857e6012e497f0ad2671e6f07
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 link farm designed to redirect users, likely to malicious sites. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=brocade+8.2+2+administration+guide+8.2 PDF link annotation
    • http://dofukatejipoz.66ghz.com/anbe_peranbu_song_isaimini.pdfIn PDF document text
    • http://teenagetutor.online/88251452806ldzeu.pdfIn PDF document text
    • http://spiritstudio.ru/pokemon_fire_red_location_guideknqa7.pdfIn PDF document text
    • http://umkatrade.ru/393154085949ngdu.pdfIn PDF document text
    • http://oneitshop.pro/462338994979q5d7.pdfIn PDF document text
    • http://amsidgi.xyz/tatudipixafozowovusoto42g4x.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/how_to_check_drivers_license_points.pdfIn PDF document text
    • http://useraisins.pro/60686300352g5vz3.pdfIn PDF document text
    • http://bufaturofonoko.22web.org/shin_chan_comedy_dialogues.pdfIn PDF document text
    • http://sipamuxagiporen.iblogger.org/povewilu.pdfIn PDF document text
    • http://bigtittybella.com/how_does_climate_change_affect_the_militaryq4nfx.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/bokutej.pdfIn PDF document text
    • http://wbigs.space/carteirinha_de_vacinao_pet3r6yk.pdfIn PDF document text
    • http://alkim.xyz/705352604649w87h.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/lolapi_poguza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_d5f11bc75ded483d9442c931f49e0d04.pdf?index=trueIn PDF document text
    • http://mujebik.atwebpages.com/gre_big_book_analytical_reasoning.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_54789037c4a7478784707167400f050d.pdf?index=trueIn PDF document text
    • https://4ebe1e6a-8a13-4145-b3c2-d2faed65f423.filesusr.com/ugd/a67e73_e009afbfdf2649908cfa24d217edc2bb.pdf?index=trueIn PDF document text
    • http://pilejifizodan.onlinewebshop.net/learning_disabilities_handbook.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 5516 bytes
SHA-256: d40437b488bc1760c40009d0fc4d096121f9809c82cfe4caaa0f09e7f5332612
font_01_sfnt_off000142f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F7 12220 bytes
SHA-256: e664f4083ec3875e0d893527b2cd02ef5cd00ee70cfbea1e6067549f75c152a2
font_02_sfnt_off00016be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE9 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00018117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18117 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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