Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba6f0c89c548e5b…

MALICIOUS

PDF

76.1 KB Created: 2021-03-28 09:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 18d5312fde8cf3e8067dcda02e7d1f2a SHA-1: 5ccd851b0806781f8af297a8226ad819a921eb97 SHA-256: bba6f0c89c548e5bab8e6e6a88701af608f25afb57a422ef32ec2b4a3fc6395a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body is heavily obfuscated and appears to be junk data, but the presence of external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://druttle.ru/award?keyword=full+absorption+costing+pdf PDF link annotation
    • http://juilopkiretlo.ru/political_science_project_class_12_globalisation6fr6s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5feb18a879ae0.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/Y4ghhaU/politics_and_war_game_suggestions.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/Thhjwhe/black_male_haircuts_with_waves.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/1X9gjjc/98937709147.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/800d38ea06.pdfIn PDF document text
    • http://mugedly.xyz/will_covid_19_be_over_in_2021mm5b6.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/wopimevaxo.pdfIn PDF document text
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/fesapimexofosoki.pdfIn PDF document text
    • http://save50it.info/video_making_software_for_windows_7l0e7k.pdfIn PDF document text
    • http://chambrehq.xyz/zidakobudorovawac9w9y.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/EuiaDjg/smash_bros_melee_hitboxes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_600c8ca3ecf0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_a16ebd414ad14bc0a987b7059c967984.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_7129210fddc443e4b03ea1a61cc29e2d.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_25acaf0c97114776a0b7186edec00dac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d5b0d9-5cb7-4a79-bb95-3aa3e2d28b21/anglo_saxon_riddles_worksheet.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_125a7a7e31924cc79db1d1f414516898.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59af4425-2aa9-4e9f-b11b-12049d2f5359/ruzivuxakedoxitoni.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 5420 bytes
SHA-256: 381ebe52c1e4416e9cec8d4666871cfc90028af4349b62acd985de549ac69fcb
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 11168 bytes
SHA-256: 308b235b398cc5302387235eda51bbdf47d264fb9ea27acd3ab41e6db6f75476