Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2702843f11c403…

MALICIOUS

PDF

90.8 KB Created: 2021-03-26 08:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8012f25fcda9e81d69ad4eb5ceb0ec1 SHA-1: 30ba493c0bb6a6338eb65768890e6f7910e78a29 SHA-256: 3e2702843f11c403af7ad4c3bbdee9f4c98169ebfcbeac6fe26d790d57d68df3
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, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Online dictionary oxford pdf' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/123?utm_term=online+dictionary+oxford+pdf
    • http://mavigawika.scienceontheweb.net/barreras_de_la_comunicacion_en_enfermeria.pdf
    • http://fogejebimo.scienceontheweb.net/beps_action_5.pdf
    • http://rawoxaxevog.mygamesonline.org/reading_techniques_for_struggling_readers.pdf
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/purewevavere-semesekosawi-sasepato.pdf
    • http://mkr-olimp.info/pirates_of_the_caribbean_5_trailer0exl0.pdf
    • http://italy-small.space/what_is_six_degrees_of_separation_movie_aboutti94k.pdf
    • http://mexicotop.xyz/badalujen02ns6.pdf
    • http://bestunew.xyz/tosogetagew1t44c.pdf
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/bomokewaxakiga.pdf
    • http://tekplafond.xyz/development_as_freedom_amartya_sen64n3f.pdf
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/gegoravukotirivuj.pdf
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/xotizevu_jezine.pdf
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/kufujufoma.pdf
    • http://vawabipoxe.sportsontheweb.net/dokekawoliwudos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_12b3f167d4a94c3d8d864a7c8fe318b2.pdf?index=true
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_5568350cc8814e22a338dde26b151368.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/14976433169.pdf
    • https://s3.amazonaws.com/kozibowisenatu/89138040417.pdf
    • http://busagawama.epizy.com/poulan_wild_thing_2375_fuel_line_diagram.pdf
    • http://bidejepeko.onlinewebshop.net/digital_marketing_interview_questions.pdf
    • http://pisatetakedabak.epizy.com/why_writing_a_business_letter_is_important.pdf
    • https://s3.amazonaws.com/putelekireza/2004_jeep_grand_cherokee_body_parts_diagram.pdf
    • https://s3.amazonaws.com/dowadotiju/tijetesep.pdf
    • http://dokebipozo.epizy.com/bookworm_adventures_2_with_crack.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010efc.bin
06d4fe14da17b498dcfbabdb6ea2e4958c21883b4fc474e1757982409d66ed5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 5168 bytes
font_01_sfnt_off000120b3.bin
5476e3b462d3b38eea3cb0f9fc3348327f761c44723bf2e764c8b2ea63e55e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10624 bytes
font_02_sfnt_off00014532.bin
c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14532 16544 bytes

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