Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1712b7c2949ffd4…

MALICIOUS

PDF

66.7 KB Created: 2020-12-02 11:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d26987297b6974b002d93c26f3061eb2 SHA-1: da1cf04e68ad17be2e7a58103493cefb0fac8f9e SHA-256: a1712b7c2949ffd46b32a951bc39edc42fd3e5bcff3f3ae97b8cd66cae7b94e7
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 0.9998

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
  • 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://trafffi.ru/123?utm_term=legends+of+aria+carpentry+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5fa69476264b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f876eed4293a.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/valewipe.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/4382002.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/661874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_5fae8763558f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f9af17965a94.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/ead799d8-82cf-4e5d-85e3-4eb8b99a71a4/piridikod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d94d44-bd1a-42c8-abbe-303d0e8d9b00/yldz_gen_balant_emas_anlatm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d02b486-438a-4d0d-839f-f441dfc7b899/83827879259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ed7dc7-7874-4569-abe6-441075dc36ae/libro_de_espaol_secundaria_primer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad4a661-11f4-4e3a-b935-f11c1b0d1459/duzixewelipuzofasididane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29c91d8-2e44-485e-880e-187c9f370773/82637468834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41f873e-a014-465e-902d-cbc0591e5fff/pezuset.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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 5332 bytes
SHA-256: 071eabc91a8554ca6bd922e2cf8fd0d79e95d061b11b6177598c3723dc2bf592
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10620 bytes
SHA-256: f1a839fef6eb4b18f90a6adff9a8ae5c22955d8a8d5d4f5669de3a3229c94171

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