Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd77e38b2cec2d20…

MALICIOUS

PDF

67.4 KB Created: 2020-12-18 06:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 253e7c849206f57f425909dc96048b46 SHA-1: 35285a29be21d8e39d3d72b3d2256f0f9e387035 SHA-256: fd77e38b2cec2d20566b327bce4fd6d7d8a3532274c7e90fcb67aa176560c28c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links, with one prominent URL pointing to a suspicious domain. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=chapter+12+review+answers+biology PDF link annotation
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fadaxusak-nuruputixidipag-fupiwow-dekuwezom.pdfIn PDF document text
    • https://majaxufekebobuw.weebly.com/uploads/1/3/4/6/134605083/d6a73b67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6a6afc6229360ecd4fc1b/t/5fd660b2164d0f203c7b4ca2/1607884978915/bundle_android_size_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07c2662-94ca-447d-bb12-e6f293602ab5/17907413705.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc360761c8c74131441d742/t/5fc70e5b5fecd2174b562f2c/1606880859884/virtual_table_tennis_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc04340-f7be-426a-a44e-d44273cc4a8a/zomurewonuzise.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b5ea81fec0096843efbb/t/5fca03d081b71b40859b4a7a/1607074768476/crossy_road_castle_apple_arcade_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d48ce3-93a4-4e7b-a746-f5035b63b05b/19481416070.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3099a92c50b1a1e857bd1/t/5fc6c0814f9413233b0a4b93/1606860930684/fiter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce613d0356d927d7eeb529/t/5fd7310adca22152605be9ae/1607938315593/54046470723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fc6525-c0e6-494a-9dcb-0ca8369a5647/classroom_management_styles_baumrind.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_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 5564 bytes
SHA-256: 3571bc4579a695ed877106d9c6575cedc6bc6b82091ae28ef6a9afe66cd6bb96
font_01_sfnt_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 10184 bytes
SHA-256: fcac433d1e1f056bd8f3692d53bdf357f558dea41add5296ef3159646bc9d816

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