Malicious PDF — malware analysis report

Static analysis result for SHA-256 b875a1349459250f…

MALICIOUS

PDF

79.1 KB Created: 2021-02-15 16:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d2ceabc0a1b1ca205a36b7c3bd19249b SHA-1: b80f989562f37aba915df63d6aaebc938e319c8a SHA-256: b875a1349459250ffd668adf04ce6b1c67b865b324c9c9ca30727e6ea002cd07
254 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 number of embedded links, many of which point to redirectors and SEO link farms, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=what+are+the+sources+of+stress+in+your+life In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5fd0f86fac438.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/jashija/kotelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_601a5b9cc6ab7.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/hetiajh/d_day_facts_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/jc8hjoM/losiradizomiras.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/ibKijhe/34227209033.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/kijjgZN/2__5.pdfIn PDF document text
    • https://cdn.sqhk.co/satumunesar/dggZjgU/wakanifikiborixegewoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xusokivaxame/4tieghh/kalurimelusekasewudizesej.pdfIn PDF document text
    • https://mokufanogokotim.weebly.com/uploads/1/3/1/4/131406807/madax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fcc807b98149.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/idghzgc/lawave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152d3e4bf63.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/tuxalowafokuvo/anjathey_movie_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/glucose_transport_across_cell_membrane.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/autobuska_stanica_lasta_beograd_informacije.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/vb._net_2010_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/xodalexobuxosizitiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/a._i._o._u_admission_form_2019.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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 5084 bytes
SHA-256: b15b0817046151c408e250f6050f4ece90fcca757c99a9feb5f9346ce6ad932a
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 12916 bytes
SHA-256: 038a50987e1813c347d8013b6c84dbcc8313d4eec7714c32f1238a0050dffceb

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