Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ab4db76645d50c…

MALICIOUS

PDF

88.3 KB Created: 2021-03-27 10:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 934319efa998fee0837141269f8f6aed SHA-1: 9cf02faef317cd8d4f180e09f76610fc131c4f28 SHA-256: c7ab4db76645d50ce4cf265a17e17c3585193f315e3e46dc41413219e02efbc5
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 0.9982

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://gimoguvi.ru/award?keyword=adjectifs+possessifs+fran%25C3%25A7ais+pdf PDF link annotation
    • http://devgame.design/dagivpozpb.pdfIn PDF document text
    • http://sodalabs.pro/accelerated_reader_test_answers_for_hunger_games3m0h9.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/87324539228.pdfIn PDF document text
    • http://titatirivizikaw.iblogger.org/pdf_to_word_converter_offline_free_download.pdfIn PDF document text
    • http://triple-doska6.club/present_past_and_future_simple_passive_exercisesyki4r.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/pokimuxa.pdfIn PDF document text
    • http://guitar.su/explorer_heyerdahl_crossword_clueibjhs.pdfIn PDF document text
    • http://shoppermarket.online/wanaxuwitotoxz9q9q.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/7663900.pdfIn PDF document text
    • https://xekotoruwogobib.weebly.com/uploads/1/3/1/6/131606212/5970642.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/eDHcqGf/xidejunudom.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/onSieon/56066159972.pdfIn PDF document text
    • http://my-favshopc.online/how_to_turn_on_orbit_sprinkler_system_after_winterbdas5.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/2480289.pdfIn PDF document text
    • http://copyright-security-ig.com/the_non-designers_design_book_4th_editionnpsb1.pdfIn PDF document text
    • http://pubguckazan.com/evidence_for_evolution_pogil_packet_answer_keyjqpxb.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/3395252.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/33186284676j9ibf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2300f656-97ed-48a1-858f-f9c63fa882bc/examples_of_effective_and_ineffective_communication_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c60ccc5-8acd-40a7-89e1-e30a404b4aad/grease_live_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d333a3e-b5f5-4fdc-b04e-847c3c7b9454/e550i-b2_does_not_power_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2edfd9-72d4-47bc-b967-492ef71f61f6/gospel_of_wealth_apush_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8dc039-69fe-4ba0-a16b-225d9e2529da/99933947282.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 5364 bytes
SHA-256: 2888875ca3b10e85acf91edf088ee0fe7fac1ef47b356bac76c23d96d94aebc4
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 2884 bytes
SHA-256: fce08cb36c02190e5234935b5ce96721ec3e58704b0a10ee1e41e1ff4ce6bd48
font_02_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 12420 bytes
SHA-256: ab8ecafc6b2cc989ae162070c3a0d5902404663c76df3cc05e2088c7180c2adc
font_03_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16280 bytes
SHA-256: ab21a9c855698d65126f177310f315a427e6cc4fa12f323a9eb18e247f7e7f7b