Malicious PDF — malware analysis report

Static analysis result for SHA-256 da12d15bd7e5c334…

MALICIOUS

PDF

82.1 KB Created: 2021-03-21 02:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d0d2d9165b71b0fe90498048d1ca820d SHA-1: 3eb91c44662701321d2e0c3ed7ae6e88570ade65 SHA-256: da12d15bd7e5c3349ff011dbc2dc1ba3ea9ff387099f19259fc0ed1b477408cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=kindle+fire+hdx+user+manual+pdf PDF link annotation
    • http://suzofovolavuk.scienceontheweb.net/tojirisubenedizoji.pdfIn PDF document text
    • http://italystore.pro/vw_amarok_workshop_manualgvnsa.pdfIn PDF document text
    • http://easylearning.space/71179528982ltpy8.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/jejukefuvukaj.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/93269027492.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/81330093626.pdfIn PDF document text
    • http://digtalcaliper09.xyz/how_to_study_for_sat_mathhnrzt.pdfIn PDF document text
    • http://catsism.com/96573271586um0yo.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/netinarugo.pdfIn PDF document text
    • http://czecheducation.space/everglow_piano_sheet_music_easymupmv.pdfIn PDF document text
    • http://ibkreactiva2020.com/bloom_and_lahey_chartl1wkb.pdfIn PDF document text
    • http://dkblogin-de.com/560019689861l6a7.pdfIn PDF document text
    • http://shoop-fp.ru/how_to_program_philips_universal_remote_to_element_tvayxny.pdfIn PDF document text
    • http://esparks.ru/zativigosa220bb.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/how_do_you_replace_a_directv_remote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_54adf96b19834ce6bf7a6bc45e9bf8cb.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_d9b44ae0502d49f29c0f01d2491313cf.pdf?index=trueIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/pomarolaxasijosi.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_71a9524f8c6c4662b6c08bda74138a24.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_53a75af2974b44bca9e59c5865e95e2f.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_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 5320 bytes
SHA-256: d73e74aa66240d1a60d23f75c3a4801c706b21ef736b6f7b9132b5d2db22a1ab
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 10876 bytes
SHA-256: 22f6305ae0532bcb7c77b5ba058327272d2443dc48b4bf4b3c5d90c2c67180a1

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