Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d98d7253b84399…

MALICIOUS

PDF

75.7 KB Created: 2021-06-12 13:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2048a0b4ca242105cbf57bffd91fb73f SHA-1: 5836f8e7335245b2d278553134399f642d281249 SHA-256: 65d98d7253b84399b03abc43a3ff8aa796bf727bc4a08601c168402d0f48c595
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to disposable hosting services, suggesting a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to decrypt a payload, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/pbw?utm_term=pdf+size+compressor+below+100kb PDF link annotation
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/c75229cb330a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_60644e63e56d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_60c105c3bac56.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/b9f2c57cdadaa.pdfIn PDF document text
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/fawugiw-ruxakolonedidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_6038fb54825c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_60c44d68ad961.pdfIn PDF document text
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/wudogug.pdfIn PDF document text
    • https://bifuwesulowun.weebly.com/uploads/1/3/4/3/134308915/pebejapilasilub-podemojijaxok-guvodigitozeja-ralex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff27515d8c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5fede982e8312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5f13ea96-22d5-4e05-9481-53bf3e414015/tl_wr841n_password_default.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9202d11-052e-4ba5-9e28-e3e34f77c519/how_to_set_up_frigidaire_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5900130-ea44-4b1b-ac54-7b02120cacf9/what_is_the_body_ecology_diet_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4167edc2-d210-479a-b274-3f7d22ddef26/82792977972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c497bea-8659-4dfb-9582-dc8feb482e66/diary_of_a_wimpy_kid_the_long_haul_jeff_kinney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49c13c5-390f-40f7-ab03-de9ba0379a94/karcher_hds_1195_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3caff28-57a3-4a38-88d4-0bc25df4dffa/georgia_drivers_license_address_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9c9a1c-7f5e-435a-a395-e5242ae97a01/penny_stocks_for_dummies_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27eec0cb-dd5a-4075-ac42-73c363ec7bdb/what_is_the_meaning_of_thermal_conductivity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4847435f-34fc-49ea-8ca9-42c2ad95a3b8/romeo_y_julieta_leonardo_dicaprio_trailer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 5236 bytes
SHA-256: eb13d4f011d7926b9b2c8078d148ad1f4dab6cb2f2895b91b1c11d79686817fb
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10608 bytes
SHA-256: 76be13e2fe276fb556cd915c7226213a0a770ea4d939fbdcb2732a1b60de4e44
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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