Malicious PDF — malware analysis report

Static analysis result for SHA-256 b742c8f00be0e19b…

MALICIOUS

PDF

96.3 KB Created: 2021-06-05 02:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43c87f87c7a082f2bf65506b71428f00 SHA-1: d153772d3a2cf362236d574f91892650cda1bf95 SHA-256: b742c8f00be0e19b0ce40a2ea2d281d3270a59eb16a93e4c7dcf23deaee74856
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'nipisod.ru', which is suspicious. While no scripts were directly extracted, the nature of the link farm suggests an attempt to manipulate search results or redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=websphere+application+server+tutorial+pdf+free
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5ff105b78ac99.pdf
    • https://static.s123-cdn-static.com/uploads/4490129/normal_60071d1ba721d.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60178f2f781b7.pdf
    • https://static.s123-cdn-static.com/uploads/4454184/normal_5ffd9ac86894c.pdf
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5fee14ea5eb1b.pdf
    • https://cdn-cms.f-static.net/uploads/4481282/normal_602418f050831.pdf
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5fe3adecd0455.pdf
    • https://cdn-cms.f-static.net/uploads/4460255/normal_602d64e880025.pdf
    • https://cdn-cms.f-static.net/uploads/4466408/normal_602f14cd0f9c8.pdf
    • https://cdn-cms.f-static.net/uploads/4496818/normal_6018a2a7b6d90.pdf
    • https://fisuxujatuma.weebly.com/uploads/1/3/5/3/135345375/fekalit-tagifa-donuvaveb-rafez.pdf
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fcfb2dddc507.pdf
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/vakika.pdf
    • https://static.s123-cdn-static.com/uploads/4476432/normal_5fcc230561b32.pdf
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5feb11701ab71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b86171c9-7c48-4ff0-a755-9cccde6952d3/how_to_reset_a_cateye_bike_computer.pdf
    • https://uploads.strikinglycdn.com/files/47473d6c-996d-4f19-be31-95c7d427f910/beterixobalaterofatomuz.pdf
    • https://uploads.strikinglycdn.com/files/e9f1e7e6-9756-4ed4-b1e3-6cee8f1ffaac/fotoruvixupeguvij.pdf
    • https://uploads.strikinglycdn.com/files/e0e00c83-4d26-46cb-b90f-291eb4e9b788/how_to_hoover_spinscrub_50.pdf
    • https://uploads.strikinglycdn.com/files/745048d7-1b57-4027-aecb-b5b21d0c3064/suwob.pdf
    • https://uploads.strikinglycdn.com/files/2d5dac21-dbe7-4e72-82db-3f00a322ed11/html_tags_list_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/8f9be408-94ba-44be-ac37-6358cc657d6f/duvenasowiwaselekikefod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c45.bin
af46e3363e8988baca02af9f807eeb0dcbcddbeef3ea5bd2270cc72b904c4264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 5456 bytes
font_01_sfnt_off00014eda.bin
918940681c66f57c10b290cb3542d1fab5097a65065694a8c09e2ce728c1543c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDA 10716 bytes

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