Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58ac41d8a841e13…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 22:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2fdc8fe08b7516dc4da5aa190a1bd69b SHA-1: 70a153b13b65060767382974210a6ed28edc1797 SHA-256: a58ac41d8a841e13c1e12a36f622737e0560b56b601f2d18a110d52d4a01cadc
186 Risk Score

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 0.9956

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/123?utm_term=strategic+capacity+planning+pdf PDF link annotation
    • https://vowimusu.weebly.com/uploads/1/3/4/6/134655535/jozekin-dogaga.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/3666553.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/igPTvLC/stickman_fight_super_dragon_shadow_war_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/bXhc5gd/hepatitis_a_treatment_cdc.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/how_to_use_a_colored_pencil2kff9.pdfIn PDF document text
    • http://nefritthebestthing.site/nenubozedexigefifojoxinesrblgj.pdfIn PDF document text
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/xuguwogot.pdfIn PDF document text
    • https://losibapezef.weebly.com/uploads/1/3/4/6/134631768/a57619fb.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/lamedale.pdfIn PDF document text
    • http://robertferrell.net/effects_of_noise_reading_ielts_answerqb4z4.pdfIn PDF document text
    • http://samaraexpo.com/bengali_album_song_mp4czs7e.pdfIn PDF document text
    • http://pedrons.space/sulifujn5x79.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/ehjgcgj/bifexa.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/Av1gcje/21537840301.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hgLohcM/my_newborn_mommy_baby_care_apk.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/9178dca7-7c2c-48e9-8cd4-70aa0083c091/88622589067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1d4e4f-9307-4605-b11c-596a52d2700c/el_retorno_de_los_brujos_critica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bc8374-750e-4851-8982-5134af943413/zopavinikudiriwavure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8197396-c6dd-4f69-8605-a0be5f5b4ec1/xovoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3fea6b-acd8-4a99-b536-d5ce1d87d21b/how_much_horsepower_does_a_2015_mustang_gt_5.0_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14132ae-ff92-44b9-bb68-b10f856a352e/gujivav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e923883b-02d4-4503-92f4-4d08555cd503/how_to_find_out_my_medicaid_provider_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f7649c-8bcc-4237-8b6a-ef773843eb68/polupigami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5c7321-c05c-4dc6-867c-6f0edf480c83/30199008386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fde220-2c37-4318-9a47-0ac4b87fe67e/sezizakaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19b64b0-d3c0-437b-81ec-904939fc1ade/24607235467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca9b16b-e43f-44e4-9738-a8b3299eb5eb/goxawuwugiwugijemevito.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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5348 bytes
SHA-256: 0bbfa10b196f037719ea9d5fc27ac739e9735d821c03712a608122d4585267cb
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 10664 bytes
SHA-256: d99be38542085d06dd5976a019654ab26f993e60e5ffe27134ec546b44fe3e05