Malicious PDF — malware analysis report

Static analysis result for SHA-256 504628ee04d2a883…

MALICIOUS

PDF

78.3 KB Created: 2021-03-18 09:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7872301c5f7084d1495392378ee018de SHA-1: dc4f50d9ae485a42575e3c23dda4742922cfeee8 SHA-256: 504628ee04d2a88341caa7c527f0d6bcbc41a729a7ec7eaf87781982ea957dd5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary external URL observed is https://jacksth.ru/award?keyword=arterial+blood+gas+test+pdf, which is likely used to drive traffic to malicious or spam content. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

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://jacksth.ru/award?keyword=arterial+blood+gas+test+pdf PDF link annotation
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/wowibarikiba-xudopode-dotarekuzuru-pajabope.pdfIn PDF document text
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/4432210.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/zekol_guxijekaxab.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/zadiwozigeverakosolo.pdfIn PDF document text
    • https://jaxurawutedoma.weebly.com/uploads/1/3/0/7/130739660/53a0bc1e4.pdfIn PDF document text
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/bokiv.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/0077bfb7-ebcc-486b-99af-77de95602ee2/gobunazurelejaf.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_5e9aecdb799646c282b641bce70e913c.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_169ab210329d4f3d94376751825d0702.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_ba6cd6b01a6c42cd9db6f55e5132cfb6.pdf?index=trueIn PDF document text
    • http://nepunefetonub.epizy.com/85708185129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ef40df-2039-4f66-ac58-8ac2ad739e33/samsung_rf323tedbsr_aa_parts.pdfIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_3e7ada2426c54a0495e0dc193083e53e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ab7eb2-c7b5-435f-86cc-760298e3d636/how_long_can_you_drive_with_a_flashing_engine_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bbd005-22c3-4910-93da-08497034655e/how_to_reset_dlink_camera_dcs-932l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7101fa-7e7d-446d-a874-8b5cb95bb57e/borujiligu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343981c0-a73f-41f3-8aa0-f2283bbf92ea/how_to_shelve_books_in_an_elementary_library.pdfIn PDF document text
    • http://mopawupebele.rf.gd/baseball_practice_calendar_template.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_b0dfc4b7860b483c9caffa998979913a.pdf?index=trueIn PDF document text
    • http://binaxasomeroxat.epizy.com/free_insulated_dog_house_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e4618d-cbd6-465f-8dd4-33c36871df0e/how_to_describe_trees_moving.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_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 5336 bytes
SHA-256: 738643291debaabaebf9e888b6a4aef747d594aff07aa2d62b2ccb30325d7f10
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10572 bytes
SHA-256: 748107f908e70242b0ea7458aa1c29a6a852f597bffc5021404033e7b25a4421

Open this report in the interactive analyzer, or submit your own file for analysis.