Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5811f6a0d20f143…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 14:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3d5328872a5b302d3d2612e5b3572791 SHA-1: 32d66804f7039dd235fb6d332e02d0de895d5213 SHA-256: a5811f6a0d20f143840724ad112fadeb9b25e43e33ee3e020be02e47aa4d713a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common tactic for SEO manipulation or to redirect users to malicious sites. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were extracted, the sheer volume of outbound links suggests a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/wix?keyword=mypurmist+handheld+steam+inhaler+uk PDF link annotation
    • http://copyrightsupporteds.com/dizazepuviraxefenegulej162a9.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/5hf4oxG/when_does_fall_starts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/NhfZe5n/death_shooter_3_contract_killer_mod_apk_hack.pdfIn PDF document text
    • http://infokurs.design/banting_list_202078cxf.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/ghih3ic/easy_simple_keyboard_drawing.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/terafexamudezare.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/ihgjhRc/31447247703.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/anjguic/photo_transfer_app_from_iphone_to_windows_10.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/sizew_zovozubelano.pdfIn PDF document text
    • http://irbestate.ru/international_mailing_address_format2zjno.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/d4254563375.pdfIn PDF document text
    • http://paypallsecurity.com/vamakovefikekapusogupam72i4p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fdb15a3db18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6047c24536bf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3101bfa2ddd74563acc47b82cbc37971.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_0ce7f950f82d478c9682ae619ba61729.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/velikovawoboneviteb.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_b618d675306247d6aace79ecb77c4fa4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/5x7_greeting_card_template_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/android_one_ui_s8_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/kabir_singh_film_song_wapking.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_8dccf97c85124570baa2620ca97ac79f.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_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 5372 bytes
SHA-256: a88a812fda4cd7bc967db8c3365a39bd35f6f5a8b77da39db5101be060560841
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10720 bytes
SHA-256: e6973a6e70a805cbe4244674da2b09c0de188a587ff77fd62b42bce8821ab80a