Malicious PDF — malware analysis report

Static analysis result for SHA-256 c213d11754ea8f17…

MALICIOUS

PDF

85.9 KB Created: 2021-04-12 12:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ae2eca9ecaf426c53e3c277818dc458d SHA-1: ceb1e60c00699387b6d12b871a0b221c222f3aac SHA-256: c213d11754ea8f1720870bb57ff74b7a63f0bef68355c3e72e0177c9e9bf6b31
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing lures. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically identifies an image lure linking to an SEO redirector, which is designed to trick users into downloading malicious content or visiting phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of multiple external links, including a redirector, suggests the document's primary purpose is to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=how+to+improve+lateral+thinking PDF link annotation
    • http://vabuletarikinil.iblogger.org/50229260740.pdfIn PDF document text
    • http://gepatoxax.iblogger.org/why_isnt_my_washing_machine_drum_spinning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_7508055014f947cc8b6e09431813b516.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovisak/bamozolawixebevuse.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/how_often_to_change_transmission_fluid_mercedes_benz.pdfIn PDF document text
    • http://memegimowa.epizy.com/dediwobediputukonek.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/51598783944.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/niduvatele.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_2b6a8366d78a4fd2a3549c32ccffbb64.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_ee04063c42cd470a9078aae571698a29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c396827-4b49-4bb9-bd2e-f0d9a0040493/jesulewetekibo.pdfIn PDF document text
    • http://menolovot.rf.gd/sanolobigutem.pdfIn PDF document text
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_c348e455eb98481a81e8be66c0f0931f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vigevot/890fxa-gd70_ff_code.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_e18e9d4df0d149fa87eb2320ceef37d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/getizar/pesarobesovagososuxejar.pdfIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_e057e9ed84eb44d6b84c71683be39fbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb0948b-536f-401c-b373-4574e84a9073/hp_probook_6550b_review.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_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 5232 bytes
SHA-256: 481a3bcb6942bc89c02680254b2c5c8b0d490933fd75b6039f46dfe126d4f929
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 10596 bytes
SHA-256: a8e47216d42642f917f82e0a327020cfaf550217eabb18b6a480c4b0a635db66
font_02_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 3232 bytes
SHA-256: af517ed0219f62e8c858ec462d43958849b7200b1aac21bfa26b5025cd253573

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