Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ae58fe3b4e5748…

MALICIOUS

PDF

82.2 KB Created: 2021-05-22 11:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f5837320b6d9a738859d882371563cee SHA-1: 7d50bc21ec70453fb930aaa605275261328d9bcc SHA-256: 15ae58fe3b4e574898cf965aac1ce61d2b7b33392c15891f526e3e8a7acc9779
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a high-severity rule indicating it's an image lure linking to an SEO redirector for phishing. The ML classifier also strongly flagged it. The primary IOC is the redirector URL, which is likely part of a phishing campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://nipisod.ru/strik?utm_term=how+accurate+is+your+natal+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412170/normal_606b44617e69b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fe3ab7596ed4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5ff3380b74322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_60041dd04c252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fd6469e9459c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_60471a191aaf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ff3ab8aa4819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fca40a3e9e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_60199a4ae0b7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5fdf9208185f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_602ec608f14e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_600c15c063d23.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/xutomoxu/57325344896.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/what_is_the_maximum_bending_stress_in_the_pipe.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/banuvawupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788343cd-4120-4b81-b705-fc6e50fab7b7/fence_gate_not_closing.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/vepatarogomoxapubisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/50885981916.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/kafibof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455235fd-57b7-421f-bd62-a22a8ea18006/how_to_use_focusrite_scarlett_6i6.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/south_movie_heroine_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa1b6a9-c090-40f1-a6e0-ec69a3943ccd/tissot_t-touch_ii_stainless_steel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822421cd-2f45-4906-9bf7-1c9c32085b27/walmart_rosetta_stone_login.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/13166116954.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_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 5044 bytes
SHA-256: e7cced15c6af84ccd366e249f2f958551406ad6c008b00a641cde02fe63eb5b0
font_01_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 11756 bytes
SHA-256: 73dbab337a0986a0fac6648d90665f07b460fd6317b14c42d537770a623aeb48

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