Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d07783ba810cfb9…

MALICIOUS

PDF

65.6 KB Created: 2021-06-11 01:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 56638b81d196f5c5b03f34583761155e SHA-1: 670a3d35342e297ca1bd40d98b0fa410f95caadf SHA-256: 6d07783ba810cfb919e7b96b726b771b935e150ac0375e9cd969d3cc1272b62c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-severity heuristic indicating it's a phishing lure with a redirector link. The embedded URL points to 'allytemp.ru', which is likely used to host a phishing page. Although no scripts were extracted, the PDF structure and heuristics strongly suggest a phishing attack pattern.

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://allytemp.ru/pbw?utm_term=agent+big+tits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392462/normal_6053b0cb3f496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_60bcd160b702a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5fd9694ca28f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_60604cdb2790f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379054/normal_5fcbfb5f3fa45.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408595/normal_60b4a45ae6fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_6065ceb69858f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504870/normal_5ffed021e7a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_6029e627679e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_604386f488157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6363415a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_601737a49f69d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_600073f41fb30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144754764/joan_of_arc_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e92902-a119-4930-8a3b-b78259212ff1/32106395416.pdfIn PDF document text
    • http://wasazejis.pbworks.com/w/file/fetch/144603417/is_there_an_accident_near_my_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a10917-847c-48da-8340-df622df085eb/keith_urban_you_ll_think_of_me_lyrics_karaoke.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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 4644 bytes
SHA-256: 2e6f6c411cedc656398e552d21f61792333c821307296976612a8cbcf0b40770
font_01_sfnt_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 9768 bytes
SHA-256: 1148b76f808dc71559def2ef4edb97ec17bb54256ded563189f568dcae70719a

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