Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbce02bf631e9f10…

MALICIOUS

PDF

89.9 KB Created: 2021-03-28 09:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b7cdd5a8084082359704741b4c3a9df SHA-1: e39323f359b711ccf08065775f7c679c908f92ae SHA-256: fbce02bf631e9f1076b52dbbc3d40c491233ec0427540d5d5c369d490f301705
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a mass external PDF link farm and ClamAV detection as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document contains numerous embedded URLs, with one prominent example being 'https://resalured.ru/strik?utm_term=ohsen+watches+customer+service', suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ohsen+watches+customer+service
    • http://italylife.pro/10_oraciones_con_predicado_verbal_ejemplos73rfs.pdf
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/5947711.pdf
    • https://puvojokuxika.weebly.com/uploads/1/3/5/9/135985507/8021296.pdf
    • http://ukrinsure.com/que_es_fotografia_imagen_satelitalq4gux.pdf
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/zupixalufe-jikamop-mosunezumavo-nefupibejumo.pdf
    • https://xibopenevitamog.weebly.com/uploads/1/3/4/4/134488628/8979304.pdf
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/158248.pdf
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/276f0.pdf
    • http://pearhaidhr.fun/72585633398nwt2k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xopugup/melegimerubakesepeteput.pdf
    • https://s3.amazonaws.com/votuweroxigezog/baekhyun_un_village_ilkpop.pdf
    • https://s3.amazonaws.com/vebenok/opera_store_java_apps.pdf
    • https://s3.amazonaws.com/vogubivajavofu/infective_endocarditis_guidelines_surgery.pdf
    • https://s3.amazonaws.com/pekatikisuruki/epson_workforce_printer_wf-2630wf_ink.pdf
    • http://sagalesokalu.epizy.com/is_tribal_gaming_income_taxable.pdf
    • https://s3.amazonaws.com/sizabo/png_bike_background_hd.pdf
    • https://s3.amazonaws.com/fejakixoweka/robexafute.pdf
    • http://dusijilesa.rf.gd/universal_island_of_adventure_orlando_map_2020.pdf
    • http://mikesivu.rf.gd/wusekezibanomijurude.pdf
    • https://s3.amazonaws.com/wunojipu/zafanetudoludo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e00.bin
ef7a46b24decbd6c046f069718b9f599633f76540cb416e4eebbcefbae2a1941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 5188 bytes
font_01_sfnt_off00012f8d.bin
0a33a296e3a76520a0fca58c2a9ba24f4a4235c47cf24f00414804709efa53ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 12208 bytes

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