Malicious PDF — malware analysis report

Static analysis result for SHA-256 9848ac5fae01aa63…

MALICIOUS

PDF

83.9 KB Created: 2021-03-28 04:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d4a9bfc0f9321898cb5a0e34966c715d SHA-1: de790acf64b7682c8ca8609b536ca9d233b2f535 SHA-256: 9848ac5fae01aa6391ca99e768f52febe14f415f07a61a5722820c7d1ab51f76
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a strong likelihood of phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ponafet.ru/award?keyword=atomic+model+timeline+pdf PDF link annotation
    • http://xuroriwonufuz.scienceontheweb.net/viwaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489404/normal_5fc5fe1ed4b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_604474281928c.pdfIn PDF document text
    • http://maturibcgj.space/579336597410ller.pdfIn PDF document text
    • http://sellforce.ru/fisdap_paramedic_final_exam_study_guidefxvle.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/74901497276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005c15354147.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/o_level_chemistry_notes_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_603ebc131b1f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxukumelukadut.myartsonline.com/76639089926.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/mamojunut.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/james_baldwin_letter_to_my_nephew.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/illustrative_mathematics_grade_10_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/nivejovegukigona.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_a3086dcf29ea4735bae489fedaaf73e1.pdf?index=trueIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/lugitanezegawizekuzatibe.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/gexabediwedezivutapasev.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/allow_multiple_s_chrome_mobile.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_6d6eb6919bd64330a92295a75842afca.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_09ca4d7f15d24561a7f311eaf8856b64.pdf?index=trueIn 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_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 4808 bytes
SHA-256: 82f42c349a598fa2105c739208ab7221eff3ae65f19e2c5fb57e5b8d291d6819
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 12384 bytes
SHA-256: ff96d2422bda3848d0b44e0944e3897b3dd40f14c1a621b0deb49199def0f3c6

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