Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b6c1c5f7226f97…

MALICIOUS

PDF

72.9 KB Created: 2021-01-06 01:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 975e254e0620b4b037d9d72ecfcba010 SHA-1: 90e17742d081f6c3b4be8e48d7f502e406a44faf SHA-256: 85b6c1c5f7226f9758d063523fc474300d5ab7d330eb51ead46395e3cb3f2e2d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one pointing to 'traffking.ru', suggesting a link farm or redirection to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

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 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://traffking.ru/aws?utm_term=free+excel+templates+for+travel+itinerary PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/wirufajomuzuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5f939108bfa9a.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/810ef160-0a14-4fdb-9917-5af1b5719a0b/pukibewom.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/juxozujusenesebuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14100175-801a-4a72-a992-b7e08560a1a7/ese_conjunto_primavera_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdfb3f9-422c-4619-80d4-a7a1d0ed7ee4/skylanders_academy_theme_song_season_3.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/mac_pro_longwear_concealer_color_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/twitter_sdk_integration_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/zokiwojavuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22588023-a50b-41f8-ba05-baa5fad45eed/rise_up_game_balloon_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab1c522-55da-4561-a45d-7923e62b36e2/77540371394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf2f390-a5f2-4a6d-956b-c01e24a07e3c/physical_and_chemical_changes_lab_report_conclusion.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_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 5344 bytes
SHA-256: 37476d292d63c9b3eff163fa94d47ccd95e4fa6281ceef04d455536c5b26f891
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10408 bytes
SHA-256: 3c0e6fd90b93996b1ce886aecf68123bba3c6572c1abfe668a0c41601323c8c4

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