Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8845f3822a9708d…

MALICIOUS

PDF

85.7 KB Created: 2021-01-02 07:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 02308dd5391ba5c92a3623e91e7812cb SHA-1: 0306e5b414d7523838154ced4fe664b9f78eb130 SHA-256: d8845f3822a9708db8af77a73cb1c3416432047e6ed66d2a214de257791e1a2c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=keystrokes+cps+mod+1.8+9 In PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/d407208bcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5fc5acdd1f6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f871cbe25563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5f947e2ae5190.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/lomisezimesojupu.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/02c32d4ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e7f2e9-02e7-4e5c-911d-d05a378c4be5/63058326255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d18421-14b9-479b-a6ab-1070be9bb1ec/chi_square_test_spss_assumptions_violated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc83646-c8af-484a-b17d-72f409712ae7/vafejaravan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00ba8ee-8bda-444a-9d52-ed7376b72706/bulisomorowipigip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331a592b-5c33-4f8a-995c-3d1283a68988/siwojemanovipugemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2039eed-1194-4669-8b6f-c898255198f3/kariwotutibojababasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91bd9f5-dab7-4174-b7d8-20e5b77d3394/70770333007.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 5548 bytes
SHA-256: 5076df964e03d2649d82a9e14fce6c87ac6e70bbba5643c0293d55a6f5812b3a
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 1936 bytes
SHA-256: 84daf345e21b08075a6e329eeacb0a13a0447ddcc3efc64e98a9a4ab9c6a9d9d
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 14152 bytes
SHA-256: 251f448197abe82d9d34011dfd62f69e65e2824d259f41876c7440909db3b1d5
font_03_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 16332 bytes
SHA-256: ca33d971d83ec5c0fd7c46adb2749cb191d9a26c1b7367778dc8250efc928d5e

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