Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc3b3b9947b5ad1…

MALICIOUS

PDF

70.2 KB Created: 2021-03-12 21:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1cbc8a5e957fa817d36583e69f2b314b SHA-1: 2909da50af05bebfcc06c84b93e5e4006c4470c8 SHA-256: efc3b3b9947b5ad1dcf71fd2af7b51efeacabf87ad49b379a17ae27bd3fe4a0e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to external, potentially malicious, content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dirt+devil+platinum+force+hand+vac+filter In PDF document text
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/9690544.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/xufaliwaruvexuvu.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/15340820317.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/jhhejd6/manetivalegi.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/kejubaxep.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/hamilton_beach_coffee_carafe_replacement_49980a.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/39452728712.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/ancient_celts.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/1974_evinrude_18_hp_fastwin_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/jjKgjgc/transmission_shop_near_me.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/6f1237f64.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/7229261.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/jahfEgd/mejutawaxuxekifepavanowad.pdfIn PDF document text
    • http://fawaxifiwuzodil.scienceontheweb.net/anexo_3_icao.pdfIn PDF document text
    • http://dfds.in/sitasafisigfqqh6.pdfIn PDF document text
    • http://kraftmann.su/dufaziuq0jy.pdfIn PDF document text
    • http://mosquito.codes/lirigoxapamomudikofasafek00c44.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/gghgVsR/christmas_events_in_my_area_today.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/f3868ec5-de19-4f2c-a6af-ff019407e624/subarisivutazesuzuwedux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c7cb8d-d440-4e8c-825b-5e746cbbbe17/derivatives_of_inverse_trigonometric_functions_examples_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85070885-a4a3-42c0-86fe-891b7f672a1a/42318147851.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 5276 bytes
SHA-256: a1b2dc36991dedd8bd6099ed5ae55708aef0792f2e72c0b344c91196c9d11503
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 11304 bytes
SHA-256: f51460549f60cdbba5dd658155c65a75d16c62578d32995fc0b167b1b4015673

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