Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3884ca503f5f6b0…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 08:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 55b5d06a220277b59821d6e7fdd10d27 SHA-1: 0f8aa41e2f3a2f672a717c83601fffd41aa0f849 SHA-256: a3884ca503f5f6b03bf1bcaad2c5901e824b7c7fdd33bb718154e21795940b9a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm. One of the primary external URIs points to a suspicious domain, 'botokaw.ru', which is likely part of a malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://botokaw.ru/wix?keyword=january+2014+earth+science+regents+answers PDF link annotation
    • https://basixafonamolod.weebly.com/uploads/1/3/1/0/131069750/bigugigorogeton_wavurefijaj_vowaroxoditabub_riponumated.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/ciijhhj/70667622744.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/xelixerezor.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/harjeYK/37539951596.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/esbxicM/16451835867.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/fGBhehg/lavofewoviga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/sunepedukizuzugomub.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_6685cb2b25ac4d8aab10425ddcd33e35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/thetford_toilet_cleaner_spray.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_b765cdec9c08468f9164560047dc66b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/what_scrum_master_does.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/raspberry_pi_python_example_programs.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c66197c91b914789ac7f7d212f7c361a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/block_strike_5._0._0_apk.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_7869ae2906834d20af244ea6f378a1f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/tosufidegof.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/microsoft_activesync_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/81235316177.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/digital_transformation_roadmap_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/act_access_control_user_manual.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_5f9f414cd70b4c499356e2514bee7c09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/lozaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/mlb_farm_system_rankings_bleacher_report.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 5628 bytes
SHA-256: b321fa13cddc619d2fbbf114dc44a1d922d3caa7b60a0aff8248bd6c61ad8e16
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10524 bytes
SHA-256: 97a77689c3aa3d1ca700825a98401a0d3b4e1c2fb6a0f8833f2f8b6fb6df1d1b

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