Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a0dea995845cf1…

MALICIOUS

PDF

69.2 KB Created: 2020-11-09 16:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0361b788f6bff7612995b2e5ed4b4ed6 SHA-1: ee29857ddc9ef3cfd1a1b33ff95e336ba33c992b SHA-256: 22a0dea995845cf189b3f648981e6f9adaf62a4cfe6d34e7ba2f2a7ee60a9c1f
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, a common tactic for hosting malicious payloads or redirecting users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this behavior, suggesting the document is part of a link farm designed to attract users searching for specific content, in this case, a 'physical science textbook free pdf'. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=physical+science+textbook+free+pdf PDF link annotation
    • https://bofunakepubosux.weebly.com/uploads/1/3/4/3/134371141/vawukozazuture.pdfIn PDF document text
    • https://lowijagaji.weebly.com/uploads/1/3/4/3/134394878/tozesow-robulexobeseked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5fa0a99a46c90.pdfIn PDF document text
    • https://tepupusaf.weebly.com/uploads/1/3/4/5/134585026/dufaxezidufufu.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/cb76b70c01.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/9630287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fa552548b6a4.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/c5707c00-e1cd-4e99-a21c-7202fa9a43b7/wusavirazegipubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e62cdd-e571-47f2-b11d-6ff398986186/gofulolok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66660293-0fa4-493a-b1bf-70d6ae20d60a/livifololemum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3069854d-7f40-4148-abbb-f3e46a8e5b28/ruwilebokefudagibupepuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62afcfa6-880b-4f7a-b545-014632fb8576/airsoft_ghillie_suit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52122a41-415d-43a0-b010-a16833e856fa/61685836602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374d677b-5112-4681-985c-8dfb22f830c4/boketevoluvuranol.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/brian_head_welch_book.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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 5616 bytes
SHA-256: 23517e243019ddf83c8fb9bed05be9ab1d8d41df9b13e79a56030a98a07898e5
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 11248 bytes
SHA-256: f802edf44dbcf79127ac80a690d3433f3fc4a033dc51ba608ee72ff9be4747f4

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