Malicious PDF — malware analysis report

Static analysis result for SHA-256 660c41949bee5b82…

MALICIOUS

PDF

76.0 KB Created: 2020-12-18 02:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a06420c524b224021534c1b7606b02ea SHA-1: 2705ee0efc142f5554a5bc85a8916d352076d0f9 SHA-256: 660c41949bee5b82c2b1189ad4176006c77c0d78f45fac8c88a1d73a6eadafef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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.
  • 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://trafffe.ru/strik?utm_term=3+wheel+rollator+walker+with+seat PDF link annotation
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/gafabiviwiz-mijowig-zabesoretos-fegubug.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/7030161.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/napofujewub.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/f8b081cb-e889-44e5-add4-b41db30ce7f5/fried_banana_peppers_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b713029a-37ea-434f-bef1-32a4087bf374/65732489006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6788eba-5b56-4910-ac1b-957155ea1f50/printable_ten_commandments_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5088aa5bc066edfc02720/t/5fcaf3cc7ab0f364aba2fb6f/1607136205232/cozmo_stack_cubes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2afee82-9835-4308-b8b9-197bb022f7af/xotunivibesubusevefali.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b942c6d96458362de91d/t/5fc49576f3de5e49b5f71f94/1606718839281/cat_woman_dog_costume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4295a32-084c-44aa-abbd-d14a1f822eb3/download_sound_bits.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc069c17d0c8f249d3e4d8d/t/5fc22d46a97599144e4058d0/1606561095643/50510769131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8e8044-04f7-4fb3-8883-ba9eda2ce158/38101919191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d9d6f9-0117-4c64-8eb0-0eb946c87d31/icd_10_legally_blind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be757d6-a781-4ce3-b046-1e8a72d1f0a7/2382773721.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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 4996 bytes
SHA-256: fc63dac639d2a6a4a476702d0d37df870e039a0884d2f131121674ddf0421eef
font_01_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 11244 bytes
SHA-256: 828cbbaf1d718a60cc328d34e7120dddc657433a91043211ed8b8ecd0d867623

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