Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf2f8a5eb2ae16…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 11:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c85f3a6294e770887e13c2f7fda77fba SHA-1: bddd9f219c37e4d5e4d1e0b77b7058cf9b7ffa07 SHA-256: bdcf2f8a5eb2ae16c2e3df00fbd2383f401fc8ef0a439330e84c7ff6e49e559e
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 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 0.9998

Heuristics 5

  • 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://xajibur.ru/wix?keyword=animal+and+their+baby+names+worksheet PDF link annotation
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/dusurapuzat.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/nujilizelozudu.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/ciijgeP/extreme_power_boat_races_2018.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/batuxo-zoziribika.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/hgqjhjN/jitijagixeketilokudekoke.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/qibcuYe/zefiber.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/Ub8jgeq/avira_vpn_android.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/golaxugimoz.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/roxujunaxu_zopewowiw_wilil.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/d7ihacy/nasal_spray_for_congestion_prescription.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/gihddOV/doxeratusefokenidaxojiw.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/xapota/82935944432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5174f221-728c-4657-a29a-588b7a1c146e/52706909526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158a7069-4a3b-4e64-8bf7-ed825351db14/96439324580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b17a1d4-dbfe-4422-ab8a-719cf7c62369/crochet_pattern_for_baby_hat_with_beard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22ecae9-2c1a-443e-8e91-9786203cbeba/boating_knots_dock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f24ef0-2fff-411a-ad17-fa3d5eea47cc/101_design_methods_vijay_kumar.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/comparing_numbers_word_problems_4th_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62901151-6db6-48d2-91ed-544666eb72ac/how_to_tighten_chain_on_mcculloch_electric_chainsaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/destiny_2_leveling_guide_750.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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 5452 bytes
SHA-256: e80d3f88a1c4ca0b54019e0ac7099373e6003c53ee545c2403d64d719dbce89a
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11392 bytes
SHA-256: 22b3292dd30101442f96ef19798047b452469c8053a7e43f639b28b5bae46365

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