Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5be1d87824c597b…

MALICIOUS

PDF

76.9 KB Created: 2021-05-20 12:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af6598f580ce51eff731889cc237ddfb SHA-1: a8074e0e21a927b17b5d49a7bb0bb699136b195f SHA-256: d5be1d87824c597ba60203943fff3529ec470403db143b7df0ee8c3e0d1125ac
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically using a medical device cleaning theme to entice users. It embeds a URL that redirects to a malicious domain, likely to host a further stage of the attack. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=how+to+clean+respironics+dreamwear+mask PDF link annotation
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/radasivasidipi-tedokakixuvaf-dowilolare-gavakab.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/bifumobifosaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5ffea6551d823.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/151e4fb74ec581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_601d4d97d5d9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417422/normal_5feb0d66b8da6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_602c256c37417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5fe1b6298aae8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fe2e8051cdfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_602050e3c3602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fdc9f837124f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_60210e8a2f10e.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/13664c0d-232f-4f4d-92f2-91fd7d2a660d/how_to_find_distance_and_displacement_using_integrals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8cf25d-071c-4204-9add-5cd13ed56816/georgia_wic_form_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/werogavazixewixezorevev.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/epic_of_sundiata_characters.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 5336 bytes
SHA-256: 47d702d80a090e17f8a69588e705b10e92cb89f0e1095569b473b551c552d36d
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 11420 bytes
SHA-256: 2604266dbdb0137cb418b4f6ab9cac7f4cc7bb9a63b8f3ca0bd24f1437c911af

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