Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4b4339276828e8…

MALICIOUS

PDF

72.9 KB Created: 2021-04-06 00:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 18dbbd89dd516a4a353cc6c5f8aef7ba SHA-1: cbecffe226c36ece153f57b38b311b0b14b98f36 SHA-256: 7b4b4339276828e8b043f3c5d67f788b3388e9a5d43c6b5bf0a56a7d0721bb88
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to PDF creation and academic keywords, likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=strength+of+materials+by+khurmi+pdf PDF link annotation
    • http://dubiniba.iblogger.org/19048217611.pdfIn PDF document text
    • http://shop50off.info/courageous_conversations_about_racebciqq.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/reuhiji/adobe_photoshop_fix_apkmirror.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/fjdjip1/buttercream_decorating_cake_ideas.pdfIn PDF document text
    • http://setifol.66ghz.com/63895808972.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/jjbEjez/fobomotuwido.pdfIn PDF document text
    • http://fexuvukenix.22web.org/alliance_x_empire_equipment_guide.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/leturadalexagu-lopawemot.pdfIn PDF document text
    • https://xaduvabelo.weebly.com/uploads/1/3/5/3/135324105/fupuxitegezutomas.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/depupopovesedu_surajixex.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/graphing_sine_and_cosine_functions_worksheetgo6jf.pdfIn PDF document text
    • https://cdn.sqhk.co/meparifemoji/gjhhkig/wemudawagowij.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/Dijhb4f/betojunamalogolexawoxej.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/ikyBQxk/get_acc_e55_walkthrough_engine_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/gigecij/lavadora_brastemp_11kg_ative_manual.pdfIn PDF document text
    • http://azalea.store/38355169366gypbi.pdfIn PDF document text
    • http://fedogiki.22web.org/buresufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 5748 bytes
SHA-256: 3b08e1fd387a50fd9924534f4933cad0491a3b46867e7bf4abb636de1259e44a
font_01_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10544 bytes
SHA-256: fb1bcf8187fe39187299e2b53d53139121a7f213dbb9218a88f6da007a35108c
font_02_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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