Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6e09b55d480507…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 03:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eebada1909331b973c4b46432bf96afe SHA-1: 43d554db7d479c6e9da75444c46eda038a89fce0 SHA-256: 5b6e09b55d4805077211843788f77c6ebef093757d18d92c01ef6d3ec79ed9ed
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests a mechanism for delivering secondary payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=6+january+national+day PDF link annotation
    • http://resimpub.com/eleanor_of_aquitaine_civ_6_guide7dumr.pdfIn PDF document text
    • http://kernig.store/lg_stylo_4_user_manual_spectrumznfdd.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/haggheH/rajilevoli.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/jjRjhO0/vagipatakowuli.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/liwopejar.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/emThfBB/star_trek_fleet_command_uss_franklin_blueprints_missions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409122/normal_602663f682b5b.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/80021745158.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/8jifUhh/boston_college_football_games_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_601e04e7a5766.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/iaggogJ/today_s_weather_forecast_please.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_604cb9863a294.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/nacionalismo_economico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fce6925265f1.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/5Hgjjjh/11537330952.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/i9iiYev/39213271906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guriseb.myartsonline.com/35045129723.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_76dbbbbbbb244ba08a96eb2b4d946268.pdf?index=trueIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/73812969839.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_527ec4a290a94add8fb50a446a769b3a.pdf?index=trueIn 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 4880 bytes
SHA-256: c4fccb05e9afb6b88ea1ac9d81d81f488efd92459bfa65e9c18fcd741914eae3
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10872 bytes
SHA-256: 1ca44c287e064b997e843d3620a6c0e5acda326535a864c23d6f22e7cd7c2896

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