Malicious PDF — malware analysis report

Static analysis result for SHA-256 799546d8dda103ca…

MALICIOUS

PDF

74.4 KB Created: 2021-06-13 02:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cf9eeaea8339487570fbada6e3039147 SHA-1: ac4b47b8ea0304dd3f1ca59fe0088bd8ac44f046 SHA-256: 799546d8dda103ca2dbf314819fd41ecf95235194167a2a7ec45bfb31d971ddd
186 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 6

  • 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.
  • 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://pixomot.ru/pbw?utm_term=anagram+solver+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418987/normal_60338b4b31829.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/duwinirog_jiriluzimajur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_6054f3e1097e7.pdfIn PDF document text
    • https://sijazeresivex.weebly.com/uploads/1/3/4/5/134502522/xorud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_60543df7f1e2c.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/6721963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_6047b0954e204.pdfIn PDF document text
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/luwilurenanidegej.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/0745a02f-dd10-482f-bea9-6fdfdeefde4e/84539277934.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/pipabexujixenigevofasejat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d3c47b-3861-4dc9-9191-cfa8822bbb28/vuwukakukad.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/name_writing_practice_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d4be02-eb9b-4b45-a835-4893539d50bc/jamalorisewofalujodebela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d441f8f-5b94-47d5-b925-36bf1b97ac7d/prentice_hall_united_states_history_modern_america_online_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61fd277-5e8a-4a48-9e0a-fe669e4f75cc/little_house_on_the_prairie_season_3_episode_14.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 4796 bytes
SHA-256: 955e1ba76514bfd8335f0c5302aaa5880afad6d616a41583945f2c5306144e8e
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 10868 bytes
SHA-256: d72f7ce003061476995e0adc707828b23224aab8fac85a017adb4c56c77d2cff
font_02_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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