Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc37dcda4c9870b1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-09 05:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d954e8dca6d9b7417112168c7701f326 SHA-1: ddef09f658e31161146cd07ffcbdc4b43e84cb8c SHA-256: cc37dcda4c9870b128fdd5abf465c3747c8a6cb42614d0eb719637d39a26ec7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful sites.

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://maypoin.ru/strik?utm_term=troy-bilt+4-cycle+trimmer+parts+diagram PDF link annotation
    • http://vetozadep.mywebcommunity.org/15786013309.pdfIn PDF document text
    • http://zolewuren.22web.org/poverty_guidelines_for_food_stamps_in_ohio.pdfIn PDF document text
    • http://buvemalo.66ghz.com/nccn_breast_cancer_guideline.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/77064849886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5ff211ce9843f.pdfIn PDF document text
    • http://dulugidi.iblogger.org/2587831368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fe8e4fab7081.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/how_to_get_your_service_engine_light_off.pdfIn PDF document text
    • http://dikerulaba.22web.org/blobby_volleyball_free.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
    • https://s3.amazonaws.com/jivala/tukowerepikugakolak.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/punjab_6th_pay_commission_latest_report.pdfIn PDF document text
    • http://wogurep.epizy.com/solubility_chart_worksheet.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_f581bdcba3464ff8a074559bd9682afd.pdf?index=trueIn PDF document text
    • http://venizowazuzi.epizy.com/walmart_near_me_opening_hours.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_84d564fc53f24ba6a4a313a689c9d8ed.pdf?index=trueIn PDF document text
    • http://jiwimid.epizy.com/advertising_routes_to_persuasion.pdfIn PDF document text
    • http://torijigiwij.epizy.com/40606687310.pdfIn PDF document text
    • http://femisudave.rf.gd/how_much_is_a_zenith_tv_worth.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/boy_scout_knot_tying_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 5388 bytes
SHA-256: 6290f63436b61de657c30e3167df15611c51791b5ff3d2b3f010db7809e219fb
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10804 bytes
SHA-256: 8881968a522e2b8ccc14737c23a2737b62ea0da984ed5a5644d52242d5cc0817
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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