Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6804f604592c3f…

MALICIOUS

PDF

89.3 KB Created: 2021-03-05 16:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 00c204abccc33ff2b67d935f1cc8cb4c SHA-1: a355761af4463c5357865c9e939f12065f570906 SHA-256: db6804f604592c3f663159286a0dee12629af8a7245f958d4fc39edd4be6d02d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'analyzing visual text', which is likely a pretext to drive users to malicious 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
  • 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 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.
  • 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://dafemum.ru/award?keyword=how+to+analyze+a+visual+text In PDF document text
    • http://jixewelo.scienceontheweb.net/everlast_activity_tracker_watch.pdfIn PDF document text
    • http://nivanugifur.iblogger.org/how_to_fix_thermoelectric_wine_cooler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_60207f88eb48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd634052296d.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/sunbeam_mixmaster_1-7a_parts.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/honda_hrc216_lawn_mower_price.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/katajexugajudovul.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/is_there_a_sequel_to_the_shining_book.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/63517946037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5fe0511ee0816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxolavomuzo.myartsonline.com/12882642576.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/is_chicco_fit2_worth_it.pdfIn PDF document text
    • http://jezosimo.epizy.com/rupinder_gandhi_status_video_song.pdfIn PDF document text
    • http://womawujun.atwebpages.com/the_cask_of_amontillado_summary.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/business_ethics_and_corporate_social_responsibility_articles.pdfIn PDF document text
    • http://womawujun.atwebpages.com/mimuwudobixumenuxapexaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a44372-6d38-40e9-acb3-21626991fc9b/97303953133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c463d727-d5a4-449d-8b7f-e9c0a0435bfb/why_do_my_apple_music_songs_keep_disappearing.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_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 4916 bytes
SHA-256: 9ecaa7da59a55d65742395918b69bf00c11253dda6da42a13b03e69d5db05e6e
font_01_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 10240 bytes
SHA-256: 7226a3c685c6e7d280ab8c6e6c8a7932e20cba9cc24a9bad7ef0a573ef16a981

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