Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d9849e761153ae…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 15:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77dc5f7fd218f26fa35ea5a67219659 SHA-1: ec49626b6d62713eaada3cb98e03f6023cd1f027 SHA-256: 75d9849e761153aeb04857472b5c18e435746a8d7d9c5845da2c1773358b5286
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. While no scripts were directly extracted, the sheer volume and nature of the URLs suggest an intent to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=passport+annexure+d+marriage+certificate+pdf
    • http://vowitufafuzebil.scienceontheweb.net/angielski_sownictwo_b2.pdf
    • https://cdn-cms.f-static.net/uploads/4388818/normal_603ec5b16b83d.pdf
    • http://lazujifoxupa.getenjoyment.net/18348999702.pdf
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/netazosivusurupusug.pdf
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/jubikowiseb.pdf
    • http://naxajogilelog.medianewsonline.com/jubutagawozeratu.pdf
    • http://yesstore.pro/is_michoacan_safe_20206ejzw.pdf
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5ff106eca6aa2.pdf
    • http://in-step.shop/digital_marketing_training_institute_in_kolkata73vtc.pdf
    • https://bifukedupojuxi.weebly.com/uploads/1/3/4/4/134498794/ccdaefd37107.pdf
    • http://copyright-rules-help.com/misipupurubumikisnu5.pdf
    • http://pozufopajosel.mypressonline.com/turbo_chameleon_64_amiga_core.pdf
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fe402af269c7.pdf
    • http://wowitaly.pro/foxudup4l6y.pdf
    • http://lofoporubatul.mygamesonline.org/26898066158.pdf
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fec4d6c45303.pdf
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/7d88a43.pdf
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5fe3670ef3fd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_057a9d5b91504f69802a82f670c906b9.pdf?index=true
    • http://sazurufupamaxa.myartsonline.com/fevunadapojo.pdf
    • http://dirazonun.myartsonline.com/jelujomomuxudomaban.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_c34cabb7d30446869e916b1edfae1ce0.pdf?index=true
    • http://supajiwa.myartsonline.com/bunarejajanaki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf0.bin
46aebff9c60d36b2c5e2ed0add7a80f10edbc449224269a24f57fef077f68b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 5392 bytes
font_01_sfnt_off00010033.bin
670b3aec1fe324308f0d4e1f8d3c75350d6dcdba9a47047434c245faf71309b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 10712 bytes
font_02_sfnt_off000124e5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 4324 bytes

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