Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ab9395842e65f0…

MALICIOUS

PDF

76.1 KB Created: 2021-03-15 01:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b66ffac5b688cbec6dc8c79d26ba0a8e SHA-1: 26e18a82461583b394641496bc611aa10dee4d22 SHA-256: d5ab9395842e65f04296af59b8460aa850eaeeb71514689dbaf4fcb7f62f6ce8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on `https://jottigo.ru/strik?utm_term=how+to+attach+headboard+to+leggett+and+platt+50+series+adjustable+base`. This URL, along with others, suggests a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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://jottigo.ru/strik?utm_term=how+to+attach+headboard+to+leggett+and+platt+50+series+adjustable+base PDF link annotation
    • http://tufofol.medianewsonline.com/75422098749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_601e06b1ee8e2.pdfIn PDF document text
    • http://tehnotop.store/urinary_acidifiers_and_alkalinizersl1n0y.pdfIn PDF document text
    • http://runivofo.iblogger.org/osrs_ironman_armor_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_600e4f0e03bde.pdfIn PDF document text
    • http://ygrash.website/rom_aosp_extended_kenzon28mo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456705/normal_5fc8691911066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_6005234d75c97.pdfIn PDF document text
    • http://wisecreditscore.info/72260337843po64d.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/abrsm_music_theory_syllabus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/205ab9d7-3c7e-4431-8b7d-49f924783989/ruwivutopawi.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_1fcef12d767d4a4b8a2e3819f4100dfc.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/37119990908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c04042e-e16e-4cd3-b08d-21d1dc409b46/ronejez.pdfIn PDF document text
    • http://zanulewetadom.epizy.com/ad_free_manager.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_7b79fcbfe8d6466eb60df76fd16d2043.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/396ee6b6-5dc4-4ab5-bde8-5ddddb205bb5/an_anthropologist_on_mars_seven_paradoxical_tales.pdfIn PDF document text
    • http://jibimom.myartsonline.com/surgical_asepsis.pdfIn PDF document text
    • http://vagunodu.rf.gd/ignou_assignment_guru_2018-_19.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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 5872 bytes
SHA-256: e5ef6171d7778067be47b77dbdd0f9281c42638a4e6c0831986e11205f5d1d91
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 11028 bytes
SHA-256: 4a909a4cb6f0e78c6fb3bbb1ede7682c4322b51a3b2e32c8c8c0122c241cba81

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