Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb545acc888624…

MALICIOUS

PDF

78.5 KB Created: 2020-11-19 07:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4aeacc2bb5db2ada16522e4591d96db6 SHA-1: 93402906adbb67bb28c1b65bd0a9fe283b825190 SHA-256: a6fb545acc888624decd247ce69d168729835b9ae2ce594159f23c309cc4e297
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, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://ggtraff.ru/aws?utm_term=vowel+diphthongs+worksheets In PDF document text
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/7004618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fb2cef47b802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5fb3fd4fc1023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8a2f73c607d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fb293a84623f.pdfIn PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/pujaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/langrisser_upcoming_banners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870ac1c8-3a36-4908-8fa9-84b733c04be6/pilibovabirabewiviguwenoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9146d35a-a1ac-4686-a470-a73270a18028/15206021481.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/mizofaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b145e8-b414-4f1f-ad4a-c480bc7227db/jointer_planer_combo_harbor_freight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5031e194-ffb8-47c5-b487-bd2acd58fbd0/zimigav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2e6d4a-f2ae-4081-94b8-34ca8c2182b8/twilight_the_official_illustrated_gu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 4920 bytes
SHA-256: 9edff6ac980d7311f6e52f43fe30a588d0c4dce0cd788418fd44e6c27ddf6cbe
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 11124 bytes
SHA-256: a00cbcad99b61933563eee1f4cf0105e447ff92b844f02a3e88b40f64a5a052f
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16112 bytes
SHA-256: 3e97d79a589830065c4ad1e18beb1fbdbcb10eb8221da9dd58cf0e8801afffb2
font_03_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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