Malicious PDF — malware analysis report

Static analysis result for SHA-256 58623d515f727dec…

MALICIOUS

PDF

76.5 KB Created: 2021-05-08 12:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d65fda5024666c7295e0984bfd8a43de SHA-1: 57a94750d0db33b3b49b3b4aa3a3da022038d3b0 SHA-256: 58623d515f727dec5da6109af4e86c0ff8f0776e221e9e29aea29fb8d9334fd5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential phishing lure pointing to 'druttle.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=learn+to+draw+for+beginners+exercises PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486199/normal_60352e3b71ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5fd0ddcd4da07.pdfIn PDF document text
    • http://italia-doc.fun/xazedabunenivufojijajole10vow.pdfIn PDF document text
    • http://goossyy.online/arabian_nights_movie_animatedxidfp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501777/normal_5fe278285cf59.pdfIn PDF document text
    • http://hhizmet.com/big_buddy_heater_size2titt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_601dbb8498ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5fdacffb4e63c.pdfIn PDF document text
    • http://nibelv.xyz/mejuxusa1iwlm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_9a6c9a500bc3400399172c8a9a7eb170.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_e16a19205d3f4da98e67bbbdbfc210c9.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_0e70bec77ffc4734aa8c3fb43e5a9f9c.pdf?index=trueIn PDF document text
    • http://tafekeremo.epizy.com/51612231962.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/gofidinuruma.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_529abbd02a94414ba95df3c93e955f96.pdf?index=trueIn PDF document text
    • http://juvudujaxajiji.epizy.com/67064925268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b67d075-1845-4342-bcc3-f43c3bbf78e8/24906540191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7334e5a5-49fb-48b3-9243-68f363383a4c/how_to_be_mechanical_design_engineer.pdfIn PDF document text
    • http://pevibizedafi.epizy.com/vagolixupatirejixafezekid.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_2aad4a9099fa429881cd2bd93238f832.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e72dcb6-1fa9-4307-b2a7-181210821795/zijutus.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/11740881915.pdfIn PDF document text
    • http://rebikesumusosu.rf.gd/46788112099.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_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 5400 bytes
SHA-256: 9498feed6183402dd6af4c3b87b37c6d96bbbc0e06ff3a5bbfd4cc1950a11593
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10868 bytes
SHA-256: b28a6a5c2b1ab8e6e9eb54fb65336d95244a0827e27af4a4d178f7d45c1738d6

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