Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1097ecfa9ebfa9…

MALICIOUS

PDF

88.1 KB Created: 2021-03-28 04:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d45ba95dceb2d8db575ada856245ad36 SHA-1: 8363cde9974f36eba7caf7963cd9e5443ff48cf9 SHA-256: da1097ecfa9ebfa93db399232cf3978133f050c22e9ddbe912474214232b7bc8
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the PDF structure includes duplicate objects, which can sometimes be used for evasion. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://midufefew.ru/award?keyword=edit+pdf+mac+gratis PDF link annotation
    • http://tunizunifegitof.66ghz.com/cursive_alphabet_small_letters_practice_worksheets.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/sinatekapozivisomonun.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/Eu1ie7P/bagomavorimim.pdfIn PDF document text
    • http://famexukox.22web.org/mebaboxamojonijev.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/dVp5jbr/41262463591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_9f0ede924c0c41648fb4de4fc95cd2ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3909f4e5-dc24-4a72-9d7d-52a0dab708f6/110cc_engine_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae17f18-1b96-4f6e-8c18-35429970b934/zurumapejazegisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147ff135-45ff-4c8b-bf42-9b68b1667f29/coach_quilted_wallet_with_rivets.pdfIn PDF document text
    • http://bepapogijarepub.rf.gd/radikalisme_agama_di_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/business_card_scan_app_for_android.pdfIn PDF document text
    • http://nepanazunisemi.epizy.com/kevapipemoguvokik.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/8504706632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5785693-118a-41a3-b9e0-338b797bc1fd/dodumiwaxemaxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6b62cc-a4c5-4133-806d-f2454062e632/xevivu.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_8af0f2351dbd422aa4083bb25bb023aa.pdf?index=trueIn 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_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 5400 bytes
SHA-256: a7f0e21696eed4d31dcbac2fac4fa3d1b67cfc1cdc81ed784952d06b344fb986
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 11988 bytes
SHA-256: e7a746a7831cd3b4284ac0b4253f92843c3ff90bdcbcc95eaa627975c26e9e39

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