Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b31abf320383300…

MALICIOUS

PDF

84.0 KB Created: 2021-03-24 23:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7fa61b5852cbcc4af3e53a993fded08a SHA-1: db17ab2f95e7f558ee1b15cd2d97af2a51665d48 SHA-256: 5b31abf32038330081781b2c31013ff77eb51a1ec61a8a85ac252c2e61e7ee3d
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that uses a lure related to printer manuals to trick users into clicking a malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URL points to a redirector designed for phishing, which is a common tactic for delivering malware.

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://maypoin.ru/wix?keyword=hp+officejet+4650+printer+manual PDF link annotation
    • http://nasty666.space/how_to_prepare_maths_for_jee_mains_in_1_monthe2dz4.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/language_in_sociolinguistics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5fca86933ca40.pdfIn PDF document text
    • http://hackins.site/how_to_install_water_line_for_refrigerator_ice_makerfgs0m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_601035e7892ac.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/barikaxugerizizorojakuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6033b5ee90579.pdfIn PDF document text
    • http://trastenmyqort.online/22564669057dotdz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60349975b77de.pdfIn PDF document text
    • http://bigwin-1xbet.fun/what_are_the_different_types_of_sexual_orientationp3fxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fe6cadd5bfc1.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/3423141439ls4fm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kujesulad/14313283042.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_c5032ff0ea954d0792599c6182fa53c8.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_2a872cb987bb4aaa9318e58ba41149b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/acrobat_reader_dc_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/alvida_ramzan_status_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/american_music_video_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/64475515172.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_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 5528 bytes
SHA-256: f4839c9a82dc67e938a46944e746f39026157516e6dbe31b9269b782699740a3
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 11124 bytes
SHA-256: 858c413a3d5db3d882794578ca8f7b19703dad61216c28e436cf50be613ca848

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