Malicious PDF — malware analysis report

Static analysis result for SHA-256 157682ae66f01b80…

MALICIOUS

PDF

103.4 KB Created: 2021-04-09 17:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66420b0bfe7acdd154c908926cbbc874 SHA-1: 426eddf7fe1eb5bab8e6109b005dcb1cb8079145 SHA-256: 157682ae66f01b809138f2f2b32edf718b88f39ba4db50887ca27a8b420ac26d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant portion pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users to potentially malicious content. The primary malicious URL identified is https://jumiwimov.ru/strik. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 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://jumiwimov.ru/strik?utm_term=33+days+to+merciful+love+start+date+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376600/normal_603175c7808b1.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/11809419584.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/pstet_notification_2020.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/the_lovesong_of_j._alfred_prufrock_summary_shmoop2y4kp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fc78b8f67c4e.pdfIn PDF document text
    • http://idealslimitaly.site/poximagavurveoc.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/all_adjectives_in_english_language.pdfIn PDF document text
    • http://wipebodu.mypressonline.com/programme_nutrition_musculation_seche.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_6061e88b9f086.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/venn_diagram_problems_worksheet.pdfIn PDF document text
    • http://fishland.store/psychology_objective_questions_and_answers_in_englishxtuz8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fce672a960c2.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/49991250979.pdfIn PDF document text
    • http://zipujesilan.22web.org/14314753235.pdfIn PDF document text
    • http://geekcods.com/dogikaparifumt2f44.pdfIn PDF document text
    • http://fb-copyright-help-from.com/str_dh750_remote_app7h8r7.pdfIn PDF document text
    • http://civiliscmq.online/here_comes_the_sun_ukulele_fingerstyle_tabsqqrfl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jagazuzigi.epizy.com/acls_guidelines_aha_2020.pdfIn PDF document text
    • http://pakilapawunafep.epizy.com/princess_agents_season_1_episode_1.pdfIn PDF document text
    • http://pikezega.epizy.com/family_meeting_agenda.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/fofuwawi.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/muragokagebenewop.pdfIn PDF document text
    • http://bomemab.epizy.com/bivasorivafi.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_off0001500d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500D 5672 bytes
SHA-256: dd58729f7226aceb6cda3acba38f732b59ed56a0ecf7334684beb665ce13af49
font_01_sfnt_off00016351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16351 13036 bytes
SHA-256: aca2ccc630b7b5cf9d63b4d747f56ed5eed6cc81f50391e4e647c7601695a8cc

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