Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fbdd08345c09d9…

MALICIOUS

PDF

81.4 KB Created: 2020-11-16 20:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1cf26d4f539302070a0a46ca8774f5b SHA-1: daf1be35d684e6a9bfe04cf94a544918caa8f860 SHA-256: 10fbdd08345c09d955603b33bbd20ca518bd1ff2b425314033a4e4fff6beb4e3
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/123?utm_term=tutu+helper+apk+download+uptodown In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f964ae4caebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5f9e11d3bceba.pdfIn PDF document text
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/4dad84767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f9438af15db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f873fb41693f.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/vugude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/bubble_tank_2_full_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/atomic_absorption_spectroscopy_principle_and_instrumentation.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/gonuzosotawuririlani.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/flea_market_appleton_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/watch_joker_movie_online_free_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/xizedelemazowuwom.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/pdf_file_structure_tutorial.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001149a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1149A 16776 bytes
SHA-256: fa556d1a90c778059a1a424d342b8dc8011a88462e11ce5ac0d045fe0e4f8ca0
font_00_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 4976 bytes
SHA-256: 0de617163afa696d2e24639b1b552e46e4072548870eaf345754daf98cd3788a
font_02_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 12552 bytes
SHA-256: e806a483a4ba4ed8f05e187ef23ffe1b95afa248dd4dd2e97df15810555151ed
font_04_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 2832 bytes
SHA-256: ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319

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