Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b839a7558ede75…

MALICIOUS

PDF

79.6 KB Created: 2021-03-11 05:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da876314a98b93a8ea9deb1e21551c76 SHA-1: 939f16113a58df77b6cd1676a46057b11fe3cdce SHA-256: 85b839a7558ede75767ee22b26b2c9fad3cece8cd60942cad6a025dd9540812c
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external URIs, including one pointing to 'ponafet.ru', which is likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to a 'dictionary application for android'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=dictionary+application+for+android PDF link annotation
    • https://cdn.sqhk.co/zajikeze/dFhcvhf/88931022357.pdfIn PDF document text
    • https://cdn.sqhk.co/jedabawefi/hhaicie/catfish_near_me_dallas.pdfIn PDF document text
    • http://drive4mclaneaustell.com/picoseconds_to_secondsj6zd6.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/hdjjWhi/zenexo.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/best_books_for_9_year_olds_india.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/aqualink_cancel_membership.pdfIn PDF document text
    • http://rigovutamejebum.iblogger.org/jagovujomigovorowu.pdfIn PDF document text
    • http://zofazosedam.iblogger.org/sivirawuxabizatalozojone.pdfIn PDF document text
    • http://help-business-media.com/zotapafudariw0d.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/69240171263.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/kihgh3Z/7265219937.pdfIn PDF document text
    • http://mp4.design/adding_and_subtracting_fractions_word_problems_worksheets0qzlc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_63c8c58212d643969f4d4ab33c452df0.pdf?index=trueIn PDF document text
    • http://petikeb.rf.gd/canine_distemper_merck_vet_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/628e981d-2fd9-4059-846a-765f54ea469a/how_to_learn_fast_as_a_cashier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3941a607-34a2-4847-ac47-c5854cbbc354/zutudasawizezakufunafapa.pdfIn PDF document text
    • http://tolibewi.epizy.com/promo_code_schweser_cfa_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80b83be-52b2-4788-aec3-da168a7cdd0d/rodamebosibofibatonarot.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_f571292cfc7a4df49e61bb5b91384a07.pdf?index=trueIn PDF document text
    • http://kubunixa.epizy.com/hp_elite_8200_sff_motherboard_specs.pdfIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_301c33bab2a7461cbb81d1cd8b53049b.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_0a2c01deec0a4067a28e70dd78cf6b9f.pdf?index=trueIn PDF document text
    • http://nisetekotixob.myartsonline.com/3048268711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb7875a-40c4-4ba4-b9e6-d1a53feeac63/dolodifitategijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26bf2a3-b996-4a71-b10f-c7b7cbebac91/sig_p226_review_nutnfancy.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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 5072 bytes
SHA-256: dafdac0c8e77d605d557708fcd9718c2fe1b9827e20ab4bfef545ee0138b4606
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 10448 bytes
SHA-256: e2fc468b134dd9667682db66154ff33e97c5f19ca49c1d1bba726fd1714eaefb