Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f9304d77033793…

MALICIOUS

PDF

80.4 KB Created: 2021-05-12 06:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b2c91ff601ec1d9add722ac613633465 SHA-1: c5a1e22471b3da060f70928d64ac26efb324434a SHA-256: 76f9304d7703379344c5ef3dc7fc04c5943375fbdecd6ef2014929411845e96c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains an embedded URL pointing to a suspicious domain, which is likely used to redirect users to a malicious site or download a payload. The document body, though heavily obfuscated, contains text related to the embedded URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=how+to+describe+a+beautiful+girl+in+a+poem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412159/normal_602124e65320c.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/xanelixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_605a1c01a7e76.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/dd6631.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/bixoz_lefudulukanolit_vajupefod.pdfIn PDF document text
    • http://zimejitudik.iblogger.org/7687506068.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/e940941286f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_6057aca4bbd0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5ffea4b24b766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_6019691e56cac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaloto/nupur_assamese_serial_video_song.pdfIn PDF document text
    • http://zimemotom.rf.gd/personal_development_plan_objectives_sample.pdfIn PDF document text
    • http://magekuj.rf.gd/car_valuation_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/arrival_movie_free_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/case_study_format_for_nursing_students.pdfIn PDF document text
    • http://zemagej.rf.gd/jaani_dushman_movie_songs_320kbps.pdfIn PDF document text
    • http://zexitan.rf.gd/wawomazabupaledodawo.pdfIn PDF document text
    • http://seweromovipuse.epizy.com/53044884452.pdfIn PDF document text
    • http://fuvimexapa.rf.gd/copper_mountain_ski_resort_snow_report.pdfIn PDF document text
    • http://telomilabevi.epizy.com/niwutanupuvit.pdfIn PDF document text
    • http://lubelulezafi.rf.gd/jutadonupi.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_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5668 bytes
SHA-256: 36f47b2780ef2cda1937730ab43457cd798871722f330923ae12156b0df67ac2
font_01_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 11252 bytes
SHA-256: 1d970e72a661c9c58b19f1dc1e846be27f2bc4540afabae0910e2e538b60fecd

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