Malicious PDF — malware analysis report

Static analysis result for SHA-256 a750ba6108aa3694…

MALICIOUS

PDF

132.1 KB Created: 2021-02-28 05:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a22537aacc9a21908a4ed37e08d412b4 SHA-1: 384f54eed9019dc2812e2e119c4baf530e12afa9 SHA-256: a750ba6108aa3694768c2e7469ec2632665061df8240710ec26bac1c53e076af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/aws?utm_term=relion+micro+instructions PDF link annotation
    • https://takibuvekinapix.weebly.com/uploads/1/3/4/4/134456834/jawulobovatux.pdfIn PDF document text
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/2714506.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/dodezufigukewetuduk.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/nutamiwefa.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/doaiiFW/itopf_stands_for.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/wuwowelewakamogejeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6036cfd3c3ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/achdu5b/vukap.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/d141d6.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/2497703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_602c52299760d.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/REbgihh/66684394285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5ff98dbaa454b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_6038d55745479.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
    • http://vevubajiziju.epizy.com/lagos_weather_report_today.pdfIn PDF document text
    • http://xeziribosivamis.epizy.com/court_reporter_classes_near_me.pdfIn PDF document text
    • http://poxemibusap.epizy.com/s_letter_pictures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/bamaf.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/epic_seven_yuna_event_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/47043201267.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/nunisowon.pdfIn PDF document text
    • http://davagutuvis.rf.gd/54390273466.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BC8 4624 bytes
SHA-256: 2d3b1b512647a3a488dc125a2551a7fe859c80a6bb4ae3e368398b3e4e8b1d12
font_01_sfnt_off0001ab5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB5E 2112 bytes
SHA-256: 9a80101ffc06edd49cb0fe53639ef27806dbeb8c5f772a4e60c4210b3fd0ac7f
font_02_sfnt_off0001b490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B490 12328 bytes
SHA-256: 31219db570af3d407dc6fd99b83c55a46f6da1f96564b7a1c158652cf869ca55
font_03_sfnt_off0001de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE1A 16352 bytes
SHA-256: 613c23e5844e01aef31ecb1084b3035484ac3a8918f65d7c662f15f9e880498a
font_04_sfnt_off0001f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3BB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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