Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db6a8df57ca8c5…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 23:11:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 640b71400cdc800bd341f1468b75db80 SHA-1: 37368810451d374b1e487563b794ec51e5776be2 SHA-256: b6db6a8df57ca8c5b71d21411b901ad5ba82e293bcf6513258a1cf57b3795d28
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=freddie+mac+home+possible+credit+guidelines PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/5078708.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/righhge/furenapizudi.pdfIn PDF document text
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/fcd4f03a939bc.pdfIn PDF document text
    • https://robesiladobaluj.weebly.com/uploads/1/3/0/8/130813577/gegelirir.pdfIn PDF document text
    • https://cdn.sqhk.co/datagemop/Xgjojba/all_kanto_pokemon_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/qUpichj/joker_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/ijgc9RK/kumajukonar.pdfIn PDF document text
    • http://wewazer.iblogger.org/lobobamegexirufiniku.pdfIn PDF document text
    • https://cdn.sqhk.co/wowobavukelo/bBsyhf6/roporuwojudibosoramivam.pdfIn PDF document text
    • http://tivazaluweze.iblogger.org/79997555222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_a2f0860389c9411a800cf3585b4629c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d747c31f-7fb6-40cc-99bb-b01576db66d7/fixinisapekazinoj.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_305dcf038dce410891da6332ab46094a.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_f68c290e00c54db98b64399482a7547e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53eff1c4-f971-4a27-b0ca-ab0443eb877c/area_of_circle_worksheet_with_answers_tes.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_eb1cc727b92d49719e2a44733fdd8849.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd63baf-6072-4ff6-a487-680bd3a41246/insinkerator_evolution_excel_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac33f71d-885a-4b5a-924a-dec65bde58fc/liwajiwetutajupoxabinap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d07f608-9869-4174-a978-af9d2e2f140c/tl-wpa4220_configurar_wifi.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_3b2f249afd6a41938b3594df62a59814.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdff36d-9751-45f2-bacf-0f3ba243e0fd/duvibaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9362f6d1-19dd-42ee-ac10-bcb09580d8d3/epson_xp-400_refillable_ink_cartridges.pdfIn PDF document text
    • http://ketawod.epizy.com/40051670610.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5580 bytes
SHA-256: dc215be812c712d9ee1d8350226e1fe7d6ecf1d0457757e78c2df9932771f89a
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 11776 bytes
SHA-256: fe3d8600ffb291fee767551477fdecc665914725868e5af6596562c8400f735e