Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27477e45cb42fd6…

MALICIOUS

PDF

76.4 KB Created: 2021-02-11 08:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 141b11c0b1132469b8dd129d5d0fa9b9 SHA-1: a82f73099a6f4a734ab14bb51abd63916cc9ea9e SHA-256: e27477e45cb42fd6d1069860ca48e009830622ba2ede6064fafe7c24cba31e1b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains and link farms, suggesting a phishing or SEO manipulation scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on low-reputation hosting.

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 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://jacksth.ru/aws?utm_term=business+process+management+system+pdf PDF link annotation
    • https://wadapunefivuda.weebly.com/uploads/1/3/4/3/134307948/rivofusisu-vadupapej.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/djictQ3/magic_tiles_piano_despacito_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/6iakgcc/87369387021.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/webusoxolowut_tetovagenop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5feb58feee4f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fc6b3e0ad5e1.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/2419140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ff7a43eb6001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_5fd89cf0776cd.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/ji3530H/xasabejudorulexuvukere.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/eicjeS8/balloon_tower_defense_6_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/bGjjeVv/22173755112.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/ecfb246641d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_602400eb262c4.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/XtggX9L/vapezegotafimuselojuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rilobun.rf.gd/business_code_of_conduct_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/gaxoxuragemurosoged.pdfIn PDF document text
    • http://kenugaderagof.epizy.com/hydrogen_bonding_in_ice_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/sivusenofedinevefujog.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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5596 bytes
SHA-256: a22d6f313671c823dc6aa5db11b8b3f40009df3acda6236609b899bc3fd5864f
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10104 bytes
SHA-256: 069eb0a3c3016dc9f24ef3a9375b48c59da7f09e6e8847dfa30c248b41a6ebcf

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