Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba3784771fda88e…

MALICIOUS

PDF

82.0 KB Created: 2021-02-16 10:35:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 40966fd012b92053a03c12e3c0ea5b97 SHA-1: ec5c92cb4ef97330152ae62b7a39c333a36fe84b SHA-256: dba3784771fda88e12717cc6a76f636da5eead5cd941b1710f7a49b96a0d045f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files, potentially serving as lures or further stages of an attack. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/123?utm_term=how+to+start+bodybuilding+for+female+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393883/normal_6013c4613f1cd.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/zjgdCIQ/diskdigger_photo_recovery_download_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/Hi3ghjd/15754465824.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/icjjiiH/greatest_songs_of_the_80s_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5ff41bbe26feb.pdfIn PDF document text
    • https://zazibarem.weebly.com/uploads/1/3/0/7/130775746/watexojitutimuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_600a5cfb8e8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_600f10d390e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600a8be3e9c27.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/1759308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_5fd8406c3ee77.pdfIn PDF document text
    • https://dewazolasimuf.weebly.com/uploads/1/3/1/4/131453174/zibokabewoku_nulegukavigu_xikaruxujozam_beluxusiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/iffjbq8/the_top_up_grant.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fcb4bcf4ab79.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/hb2hfTd/words_in_a_pic_2259.pdfIn PDF document text
    • https://cdn.sqhk.co/tubozejo/hdfihDM/victoria_sponge_cake_recipe_with_baking_powder.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/jjgaahf/79941133019.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/ieFDMij/kirilawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_600f02a6dceaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 5520 bytes
SHA-256: 0a340ec2b8754386996da930c028ff75465019c2c21e48d9925cbeb0041dfb3b
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 10324 bytes
SHA-256: f9a4a432370b3ca0422746157170611a999c37fd6798664a349b3225557a7c06

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