Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d652b3d1c26eb5…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 23:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b0cda43afe69b1f5134ee4591e54c4 SHA-1: 7a646ac989e21db4ba4ab6f9f8a95439aba8d3b9 SHA-256: 80d652b3d1c26eb58f9cf90f4cd69b7c914ebd2fc41ff1fac619b4d0e076f855
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The presence of external URIs and the ClamAV detection further support this assessment, pointing towards a phishing or malware distribution campaign.

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://midufefew.ru/aws?utm_term=navien+ncb+error+code+003
    • http://axecheat7.xyz/v_for_vendetta_graphic_novel_sparknotesbwzzh.pdf
    • http://zhenskiizhurnal.ru/ge_roaster_oven_recipes_turkey353y7.pdf
    • http://zugemenelil.medianewsonline.com/basic_accounting_rules.pdf
    • http://ttop-shop.com/basic_c_programs_for_beginners_geeksforgeeksftz48.pdf
    • https://cdn.sqhk.co/dugelabomaw/7hdhajd/kusebikaxeg.pdf
    • http://matimomewojime.mypressonline.com/lubavirivu.pdf
    • http://axecheat5.xyz/panasonic_lumix_dmc-fz2000_vs_fz1000_iix7932.pdf
    • http://worldhold.online/critique_paper_templatewo20f.pdf
    • https://cdn.sqhk.co/pesamelez/csihgjA/city_car_driving_simulator_2018_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_e2c1087cd50e499396305069a1981c7f.pdf?index=true
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_989b9ea3bf44442c91060a131decee54.pdf?index=true
    • https://s3.amazonaws.com/lurutopobi/tokizolajof.pdf
    • http://kakasis.onlinewebshop.net/biosynthesis_of_auxin.pdf
    • http://bememikat.onlinewebshop.net/logabizevemaratedaromeja.pdf
    • http://bogalibamadom.myartsonline.com/67247143564.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_5efe9236a2f44c2888896cc37b44b6db.pdf?index=true
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_394d56135bf3490fb717c3084bb966d9.pdf?index=true
    • https://s3.amazonaws.com/gedexim/vabididojuvewijufubekata.pdf
    • https://s3.amazonaws.com/farefasejikap/gutachten_jura_welche_zeitform.pdf
    • https://s3.amazonaws.com/fuvidokibet/canon_pixma_mx300_driver_free_download.pdf
    • https://s3.amazonaws.com/dazifozixawus/amazon_kindle_books_free_s_uk.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_off0000ef09.bin
4807ab5f5b3f61a214c01ecebd2df442b199cec23a4423e41ee3c697f3432054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5200 bytes
font_01_sfnt_off000100cf.bin
783253ad4847c9089ada85d013d7f99c0610713d99e0b94cebb5513f27782fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 10504 bytes

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