Malicious PDF — malware analysis report

Static analysis result for SHA-256 669b871804dd965e…

MALICIOUS

PDF

117.1 KB Created: 2020-11-12 16:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0396374a465bedaa35b1f654db3e11fc SHA-1: 2ae908baf67f98d7c3d0e0f72a423c67277a6d50 SHA-256: 669b871804dd965e96dde23b5599121272a9864db935faa7fee7cd068372f340
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://trafficel.ru/123?utm_term=shadow+grasp+pathfinder PDF link annotation
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/duzeminesepamo-jimijemu.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/1399084.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/tubakidejalupefuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f943a92a0706.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/vanarefolidev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5f8cec2a214a4.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/a34f0013-67e0-4a89-92c2-c542ed301daa/13802378631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a323d27-632d-4025-a38e-da622ea2d3f0/84496889805.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/witiduweguravad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c2e524-3873-409a-9f50-327e99a2f57d/genogizowoguvopomizam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ef03c5-2e96-40bc-ab43-bd6ea5c44dab/wezexadifomininapufexud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca23c0f3-e343-4191-b50e-96a0f6c48ad9/11510862683.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/nugawevedibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349814e5-05a6-4a35-a33c-525cad128406/kaisi_yeh_yaariyan_season_1_download.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_off0001906a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1906A 5464 bytes
SHA-256: 531ed1c9ea4db6488cf1c4e09cbfa8ee70667365f6d7d608aadba03ff7e2fc07
font_01_sfnt_off0001a310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A310 10936 bytes
SHA-256: 99fe40af01743765a15f79978b4b0cfb81890ba5aa62ff8d9b7f99de26e418ed

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