Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade94fb2a491af61…

MALICIOUS

PDF

77.5 KB Created: 2021-03-11 12:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c2bbe4e6e66099925a935d00a805f15 SHA-1: 31e31629975161c0630da8a40a0354db17f190c7 SHA-256: ade94fb2a491af6160b6edfd6c243b197ab28f6ff5b0d095b4e9482d640990e4
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 0.9995

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://jumiwimov.ru/wix?keyword=hplc+solvent+polarity+chart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5ff9b71e9f323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5ffb3e1ef06fa.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/aRiciew/81447712258.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/dShblih/best_online_course_to_learn_to_sing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_60454b38ddb31.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/XSahghc/barber_shop_near_me_walk_ins.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/bCLOhfq/go_karts_near_me_orlando.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_5fd76276b35d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fd1d2506c4b1.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/5b917197-f222-400b-ab48-df60702bb51d/gejewaxezonutawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac2a5d1-552d-4836-88ee-862f70c15a8a/7168889855.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_ebfcdf9a22674e2b8c5faaefced89d67.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_70e8e237975542d689d9fc95519aa5eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97ba9b7-39bf-4db1-8dff-a42259a80449/95837671133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28672efd-4d1e-4355-a8a2-87687a9b02ec/fubobajewomuwutemapube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fe311d-1aae-41fa-bd57-16a05a24e006/how_to_install_boost_controller_on_external_wastegate.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_f01dbed6a001494e9ff8d7e4c871b11a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9366790-e564-4018-881e-87dac3ee2135/ranger_bass_boat_metal_flake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a223faf1-ab11-4d11-84f7-1c50034e93b3/2788846741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9e05c1-8e77-44fa-a596-68f7b289c070/what_is_the_lowest_populated_city_in_the_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6adc0b-da0d-4de1-8a06-246cb28f9c4c/51677132254.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_a0269517538c4f078cade0a9e977d172.pdf?index=trueIn 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_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 5144 bytes
SHA-256: 5245a7975f308ef2553801aeb2b9a86500c5caab8b11fd52d58ae4f9f4a1aa40
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10372 bytes
SHA-256: 8a08e212207cd47493f0cacd72ce4779a8e23a0244b38d3888e37e25878a8990