Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e98c90dd6e15a5f…

MALICIOUS

PDF

72.6 KB Created: 2021-04-16 12:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 091201221dc74fb04ec45ebccbefa15d SHA-1: 4904fd74eab3e6a3fe81064a730e7bbb65966e1a SHA-256: 1e98c90dd6e15a5fc3748b57fb6bc0184548659f4ba86e7620c494ea4510e249
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, particularly 'https://golowaki.ru/strik?utm_term=la+culpa+es+de+la+vaca+para+ni%25C3%25B1os+pdf', suggest a phishing or malware distribution attempt disguised as a children's book PDF. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely leading to further compromise.

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://golowaki.ru/strik?utm_term=la+culpa+es+de+la+vaca+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/pemawazi.pdfIn PDF document text
    • https://cdn.sqhk.co/daviluzabidi/zdehcKq/39032389111.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/39260353456ntzwl.pdfIn PDF document text
    • http://homeolimp.com/fallout_1_guidep2yws.pdfIn PDF document text
    • http://difedoko.22web.org/irregular_verbs_spanish_present_perfect.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/303b3469.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/cgthjit/wallpaper_pokemon_all_eevee_evolutions.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/lukaturovoxi.pdfIn PDF document text
    • http://nicechange.space/aptamil_soja_3_informao_nutricionalwc7n8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledugezutixajo.epizy.com/game_the_perfect_plan_south_indian_movie_cast.pdfIn PDF document text
    • http://talodidijuxeni.rf.gd/carcinoma_espinocelular_em_ces.pdfIn PDF document text
    • http://wepaxilex.epizy.com/english_conversation_practice_worksheets.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/brat_diet_patient_education.pdfIn PDF document text
    • http://dogiperij.epizy.com/metabolisme_karbohidrat_glikolisis.pdfIn PDF document text
    • http://nakepusejedub.epizy.com/42087197985.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/latest_bollywood_movies_free_khatrimaza.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/accessing_and_ing_your_facebook_info.pdfIn PDF document text
    • http://medevigad.epizy.com/fubujisuji.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 6588 bytes
SHA-256: c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
font_01_sfnt_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 5364 bytes
SHA-256: 15079160440ab476fa2272a60d5a9bdc828896254912753942cf23bdc4b899c6
font_02_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 11488 bytes
SHA-256: 4d181f12243cef81d77d133d79942b762df0e9c5c81ca73b84e4e0a34de9f815

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