Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6385725af5fb1b6…

MALICIOUS

PDF

83.1 KB Created: 2021-05-18 23:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 835a48ff74397009971d434a1d3b4656 SHA-1: e35a6230d58684c68f01e780042d5277a866d425 SHA-256: b6385725af5fb1b62a180ed7e63b159b1cd650005c5d6f2114f8ad528856290a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=panasonic+cordless+phones+with+answering+machine+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5ff25ffa4ac99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_6050721603425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_60559b2d3589a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5fe0c2dc93e8d.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/pozigi_rimarop.pdfIn PDF document text
    • https://doxagazezuzizum.weebly.com/uploads/1/3/1/6/131606815/fixiwup_fevobavo_kikitut_nuzikexoj.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/night_shift_cast_season_1_episode_5.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/wepelojetunufarimaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6017f6f3c1632.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/rokuwapesu/apex_launcher_pro_license_key_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651973b3-c0da-433f-a439-24197528e192/duxuwovefi.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/2799978240.pdfIn PDF document text
    • http://puxujedupis.epizy.com/52919429655.pdfIn PDF document text
    • http://mibaxeruwo.epizy.com/lasaxetom.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/how_many_carbs_in_an_arbys_classic_roast_beef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862d63aa-2b83-4f3c-98ca-315a811d451b/panthertown_valley_map.pdfIn PDF document text
    • http://zekibinixosa.epizy.com/navigators_of_dune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6946d449-53ae-497b-9678-6f5f485dc5d5/27474164701.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_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 5580 bytes
SHA-256: 591744b245c9da2274961eb1df5575b6a578a96c984632dae847b016e517e967
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 10828 bytes
SHA-256: cccc4ca46ca52cfd3e4adc6303036588348c20c53127f0109f0927b2f28f5248

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