Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48972c74cd7f364…

MALICIOUS

PDF

74.9 KB Created: 2021-02-16 03:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc049a3723a7f2bffa8e6db7944e9e77 SHA-1: fbb0acb5b8e954440de6bead77727cc7841400ee SHA-256: b48972c74cd7f36487d160204f37c32ca0dacb7df70cf7547ac812df891f004e
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for phishing/trojan activity. The embedded URL 'https://leonvi.ru/wb?keyword=how%20to%20cancel%20la%20fitness%20membership%20in%20person' suggests a lure to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and URL reputation point towards a malicious intent, likely to redirect users to a malicious site or download further payloads.

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://leonvi.ru/wb?keyword=how%20to%20cancel%20la%20fitness%20membership%20in%20person PDF link annotation
    • http://sfr-espace.best/anaconda_3d_gamefon4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ff3f1fd8cb68.pdfIn PDF document text
    • http://begdas.fun/35882020595qwqou.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/FYOG0gg/king_kong_2005_full_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/7heheVV/all_us_shopping_mall.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fe7309da56b6.pdfIn PDF document text
    • http://jujasoje.iblogger.org/8811432345.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/uSheLGC/71331193610.pdfIn PDF document text
    • http://orbitan.fun/call_blocking_app_androidfipfv.pdfIn PDF document text
    • http://fufibubesex.iblogger.org/53974486959.pdfIn PDF document text
    • http://flathead.us/geometry_basics_homework_4_answersumzm2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5ffaa93d6efc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pukafenofi.epizy.com/animated_arrow_gif_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/2636581198.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/46223673709.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/kindle_for_pc_version_1._24.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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 5448 bytes
SHA-256: fa14044555ff665b619e6092724bef986b11f0a3aca757472b3b6cc6a107eaf8
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10504 bytes
SHA-256: 1d8a6da200d923a54c0731f6cd77778c3e4ff5912d8941162570ffbd3b27f37e

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