Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bbe6cb31754a22…

MALICIOUS

PDF

80.2 KB Created: 2021-03-01 04:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 52992e7b7d8c326e5128cc5495139621 SHA-1: 724441cae4e034567732ed67d5468f6ab1415857 SHA-256: 65bbe6cb31754a22bd416bce69ef24f16b2aa082bbc9b04542bee798979a5a1c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially obfuscated, contains a question about a malfunctioning dryer, likely a social engineering lure. Embedded URLs, such as 'https://midufefew.ru/strik?utm_term=my+dryer+won%2527t+turn+on+it+just+buzzes', suggest redirection to potentially malicious sites for phishing or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=my+dryer+won%2527t+turn+on+it+just+buzzes PDF link annotation
    • http://freedate18.xyz/zomikiwudoxerugurvhmwk.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/ia8Ksds/anubis_gods_of_rome_gameplay.pdfIn PDF document text
    • http://skidki-day.shop/easy_piano_sheet_music_for_jingle_bellsjqcfs.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/dEihBXp/ni_replika_xt_review.pdfIn PDF document text
    • http://arnautmebel.ru/child_care_benefit_formqitzr.pdfIn PDF document text
    • http://mivetys.xyz/43655741962p53bi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5fc906af69d0a.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/ajbodje/ps2_platformer_games_list.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/hornady_reloading_bench_stool.pdfIn PDF document text
    • http://koprovk.xyz/korean_alphabet_keyboard_stickersuvc4t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pobopujobezov.rf.gd/76761440649.pdfIn PDF document text
    • http://faxumev.epizy.com/gisukipaxi.pdfIn PDF document text
    • http://lasesesavobopom.rf.gd/one_with_you_sylvia_day_ending.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_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 5076 bytes
SHA-256: 1ba9176cdbdf8709d22e8b17dbd17fc2282fd28b3462d721de9d9e14216ca61e
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 11824 bytes
SHA-256: 28d03716aac0b107ae213b45e6ce4a6631b966e9aa3e1cc81991c5c20e7965c7

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