Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfea1453f31399d…

MALICIOUS

PDF

67.4 KB Created: 2020-12-23 01:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 72e3c3ae20cad65defee5a495f50e05b SHA-1: 98ee616b604b664e878c72f6cddbeddfb0d756e6 SHA-256: 6cfea1453f31399d82351e19a658a561f52f449c84f7f7d3996c8a3336e37662
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a 'word of the day list'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=word+of+the+day+list In PDF document text
    • https://kozewofedira.weebly.com/uploads/1/3/4/8/134899359/5756748.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/d796030.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/1be76e34-7651-43e1-a233-d63001aa438f/3711814419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeada576-53ba-4667-ba57-6622561a0d95/monster_high_webisodes_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212ac1cf-e21e-4141-ad44-e236f074a345/silex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2979f7848ba205d236332/t/5fc3ef063c6ccf69f3d81d1d/1606676231666/sudelatasonufo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/sitotubev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6e95e4-4bd5-43a7-9878-e8e5dea56f03/charleston_rmc_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa439239-a713-4522-8487-782076273d4f/fakusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debe0d99-b381-45b6-811a-5a139c46458b/f2p_str_pure_guide_osrs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc525d588c99b6d37c2e2ed/t/5fcdcb43d235d37878e6ad33/1607322436611/lily_s_garden_ads_storyline.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_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 5112 bytes
SHA-256: cbd3a00dbce661a87dd19cd125f526716cff7a1dbac2aa2f6bbc1ea239ad52e0
font_01_sfnt_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10684 bytes
SHA-256: d9774f741cd787f59b5a10c9f11837b08980e732745d83926d9a6dd61902466e

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