Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8b1c7d7b14a454…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 17:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90eb6fba7fb7b7a29bb65f8a34a96e24 SHA-1: cae996ab0f12ce83656e370dd86bfc483c885240 SHA-256: cf8b1c7d7b14a454c9ed7b1f4cf2db6c99fb0e6e66b08079099782931625729a
156 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. 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
  • 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.
  • 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://baarspo.ru/123?utm_term=substitution+method+worksheet+answers+with+work PDF link annotation
    • https://cdn.sqhk.co/pezolaje/XXINRBC/black_screen_windows_10_install.pdfIn PDF document text
    • https://cdn.sqhk.co/gakilofod/jEeljjh/jifekogur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fe7a2e70cb3f.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/hg4Cgjv/30509814743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fe5c166eb356.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://uploads.strikinglycdn.com/files/edc5f3c3-f296-465c-bf38-057a402ae841/which_universities_are_open_for_2021_late_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/gabokalaxiboze.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_8348371b742e457a879419087dd45731.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/fafudow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68dfe339-c5af-436e-89c6-cc1bed043571/2015_jeep_grand_cherokee_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97a02f2-1b7e-4133-ba5c-ab95a1120b8a/duwiduxibilamuzozabisuvoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/ford_mustang_mach_1_1969_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/automotive_air_conditioning_troubleshooting_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3155885-0f0c-4a25-9c5d-be72d8550f92/xazisemulib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f44270-2620-47a5-ac3b-9659c5cdf3bb/how_to_reset_ge_spacemaker_washer.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_6e64dfe0e7844bbdb7bf9a775af1e26d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e70917d-4997-4516-bf0d-ea5be6e6792d/new_yorker_cover_december_14_2020.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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 5316 bytes
SHA-256: b37d1b617f8cd3f5c5e7150d7fab5771b5a0a7aaae13779d8385dca0b9e26590
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 11036 bytes
SHA-256: c21386ff3769e3fc9e4c270b2035c121a3e9984cddb0507dc4d1dcf34ea28f09
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
font_03_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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