Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852a61b4d10a4c2…

MALICIOUS

PDF

43.7 KB Created: 2020-11-09 10:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 2adf5ed52f0d9ca4ae91cb0ef220c1e7 SHA-1: 91a316229243bd3a7d1e24c11134883577593c8d SHA-256: 7852a61b4d10a4c2b41b4d2c080ebe34246ff21f41e01c9483aceb2e108e15a4
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/rimijurogarov_kimowusaxu_wokibapumuwoxug_vapis.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=roblox+generator+2016 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_5fa4b08d6f634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5f8d138e4477d.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/rimijurogarov_kimowusaxu_wokibapumuwoxug_vapis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f9286a3d04b4.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/dezozusafaxegan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84f9e243-1e41-4c97-84ba-39a66d858a84/45070759752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09ef827-c248-4a27-a118-28bdb47b84fb/21633795022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4a6c8b-0085-432c-9934-9b3eb7f26764/i_love_kickboxing_oyster_bay_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722dee82-c519-4d7a-9006-2613b94e9660/41103529150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5d3a34-acc2-48c8-a997-0a1bb2fc8e3e/33847836062.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC3 5108 bytes
SHA-256: c0b50e7830fed6c278c940d094356a78ce53b927e6be8aaf44b71c850dd35e30
font_01_sfnt_off00007130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 10356 bytes
SHA-256: bb4132d05f4b4455c8e0fd36e76eb11cc5b840e8a9771699d953fb8abfa472df
font_02_sfnt_off0000948e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x948E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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