Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f505b7faf20e675…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 23:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed05e5320c1cd392e8888c91ffc01f4f SHA-1: b5a3ad4afd2783c8e9b8773d7b36ed55922b55b4 SHA-256: 8f505b7faf20e675c17f6b1cb5dedb0694aa145ca3811a9b72a1b4828e014b8e
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://bologen.ru/wix?keyword=what+are+the+three+main+patterns+of+settlement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464080/normal_6039285fa71fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_603c4648b43b2.pdfIn PDF document text
    • http://50offstore.pro/lugogikadotagumotokmd7ke.pdfIn PDF document text
    • http://boxberry-24.cc/war_as_i_knew_it_patton7v3sj.pdfIn PDF document text
    • http://instapodarok365.site/tiger_scout_bookb2cr4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_603e36b714199.pdfIn PDF document text
    • http://tipografiyav.moscow/catch_fantastic_beasts25d9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_601ae32b004df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5feee734ca286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_5fd9d303b7458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_604cbb6895a21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_b3ff06c62dcc4112a5d5aabca766f104.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/amazon_app_store_android_free.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_93916d534ba14f16a347d19725a7a2e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/bihar_map_full_image.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_32ab88c9a2614c8e98dcfd659c5f4ec0.pdf?index=trueIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_50a845e0936d48d78919e7718e11c393.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_a8e21a83ebbe4435862c3023859e4231.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/jodegovegugada.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_4885dbcecc434f979a1b2e9462db4bc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/eternal_city_wielder_guide.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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 5156 bytes
SHA-256: 13d89d537a813ef53d36b3ad17c126bb8361618d1d75a4f654ebebc6ef1a32af
font_01_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 11124 bytes
SHA-256: 6e3a8b6c0ea812699cae2b6fdd903bda55621afdf01a6b5ba750349841c1badd

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