Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b913b175402004e…

MALICIOUS

PDF

86.6 KB Created: 2021-03-17 20:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d7d85b1e78545f652c56eb0214ee431 SHA-1: 974b64af62cef92a638de3a119f9ecfc4e68f03d SHA-256: 8b913b175402004eead9322784d51d4092ec2e54c6707d6fad5ec687900cf2f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=pandemic+2+unblocked+full+screen PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/clhg1if/61192283166.pdfIn PDF document text
    • https://mogiwivimar.weebly.com/uploads/1/3/4/7/134731652/7b63602.pdfIn PDF document text
    • https://xenesadu.weebly.com/uploads/1/3/0/7/130739949/6014419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff48ce92ce86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fca91591be73.pdfIn PDF document text
    • https://xafuzijinole.weebly.com/uploads/1/3/4/6/134667747/sexinevel-zamezogabe-nodowinom.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/f63939.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/485537.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/9ca4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5ffeb26d2b0ac.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/gdjjqgj/quick_school_parent_app_for_laptop.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/potofofagumifode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5fefb9082b3b0.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/2jfXicG/vikings_spin_off_series_valhalla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_600f48b2e967b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/poxurufoxomoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874fcb0f-d7c3-4b00-b57b-bd996b623b52/how_to_run_a_market_stall.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/british_passport_application_form_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548b61ef-2407-46b0-96f5-1f91784fe9a8/harry_potter_and_the_goblet_of_fire_trailer_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1ea00e-207d-4578-895c-c2ef145bfa77/barrons_math_2_reddit_august_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62b10ac-2e7d-4eb6-bfa3-3a30b2a1f72e/arcadia_tom_stoppard_character_analysis.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_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 5504 bytes
SHA-256: 83d00e04ac9727c8b5e5d3c722eb68817bd9a48dd4a3a1078f73b2fd284b8faa
font_01_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 13024 bytes
SHA-256: bcd12aee274b89808a33643d15e587c5d3f46d5b746276ae42072d85d8b14653

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