Malicious PDF — malware analysis report

Static analysis result for SHA-256 779131c280f1f51b…

MALICIOUS

PDF

76.6 KB Created: 2021-06-11 18:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1fbfe9e14364820522e1f54eeed5bc3 SHA-1: 41c8d291d8163abf49555947889e5bdbe305aaab SHA-256: 779131c280f1f51b2e46ebb49a93089ec82132f0efe6f74855f64664f637f98e
186 Risk Score

Malware Insights

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

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 0.9991

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://nomylo.ru/pbw?utm_term=gelfand+shilov+generalized+functions+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460972/normal_5feb79686d1d6.pdfIn PDF document text
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/tekujetobumajifid.pdfIn PDF document text
    • https://lotozuxefad.weebly.com/uploads/1/3/4/3/134316708/mizowada-baxegibelukeke-bikaxexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_60298c0ae1e3a.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/joleni_gapif_zexes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_60c1144cb8399.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/tokikevogivejimum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367674/normal_600441af21004.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/e594e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorazokazog.pbworks.com/f/dikolerebubumelawoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847143c0-72c3-4cd2-ad81-3931d112e946/rejabofovijuwotoluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32be4e30-2143-4a92-89df-006f300c1795/cant_help_falling_in_love_with_you_lyrics_and_chords.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144582945/835568530.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/avast_secureline_vpn_activation_code_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06308292-0156-4cff-bf37-04f79e43d990/domenevuvobojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4e0053-fe82-45a9-94b4-5f281b95f9e2/quadratic_equation_word_problems_class_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c33131a-a228-46b6-84a2-c78bb76194ba/sun_tzu_art_of_war_business_strategy.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/what_are_bad_character_qualities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e32e3e8-71d8-4327-a7e9-58aca84111ee/xemewubojagodusogetadinob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d15165-b0b8-4d5b-8b45-ce8f370ede3e/2001_subaru_outback_steering_wheel_size.pdfIn PDF document text
    • http://fenetikuro.pbworks.com/f/11596790178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06de3dda-14cc-47ec-9235-677b399b924e/how_many_hours_does_it_take_to_write_a_screenplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec189969-ebf2-46ff-9591-ae5db673e285/how_much_is_a_2014_jeep_grand_cherokee_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3a24d6-41c9-4f50-beac-68bccfa3b0b7/zoxifusutogilarifotefux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aba507c-cf4b-4adc-a592-035f3e01ccce/class_11_business_studies_book_poonam_gandhi.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5560 bytes
SHA-256: d2f3d583c496a7cc5bd1e5fa0566d4551af474c3ada540e24303dc3249796ed6
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 12080 bytes
SHA-256: 49281aeee373289a499e42241ba8299cbfbd9e2b02e11ab186998932fe969295