Malicious PDF — malware analysis report

Static analysis result for SHA-256 532f96b0ac7b9524…

MALICIOUS

PDF

121.2 KB Created: 2020-12-18 11:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2ef290612b12ed270d7111bceab3e34a SHA-1: e121ffe41860b0dcdb142dd92521b54fa89d2712 SHA-256: 532f96b0ac7b9524a40d7bb9db7213e85b7cec7f887537503629d903c774fbd4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, many of which point to external PDF documents, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://gettraff.ru/123?utm_term=ang+probinsyano+dec+28+2017, which is likely used to funnel victims to further malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • 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.
  • 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://gettraff.ru/123?utm_term=ang+probinsyano+dec+28+2017 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fa0cc0d5186e.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/7157624.pdfIn PDF document text
    • https://zozovuxogufeduw.weebly.com/uploads/1/3/4/7/134766710/9bbe41e3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc525a9e2fce462bca77587/t/5fcd5c94d336b863f0d3f696/1607294100591/64712235701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e28a12-840e-4986-92a4-d8a88b422cba/97990508479.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/25967708018.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/6406839002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60064219-1416-4ac2-b6e0-4c08c2bd2690/computer_networks_a_top_down_approach_forouzan_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/fewilajifir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d5239a-4f14-403e-8d38-d22bacac126c/21289764229.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/abatec_informatik_gmbh.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57202b8467722f1f27178/t/5fccaff0f94b6402b2168d89/1607249904561/89034700609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7f3076-32e7-4628-ab16-b2de1db7b77c/doce_vida_de_pacientes_y_muerte_en_b.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/wesonulivodofuzeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e1da72-4e3b-4a89-9d13-a77423152ad9/milliner_london_os_relgios_revisam.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186CA 6040 bytes
SHA-256: a5dca3c3e4378129b5f366eca89d89523980aa9c16cbb10576e01c5b616b7aa9
font_01_sfnt_off00019b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B75 10892 bytes
SHA-256: d1494dac3aa8997f16deadb7bdee59f6373404aa853b0ee1b190b084045a31ae
font_02_sfnt_off0001c0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0E2 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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