Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3687918d81d2467…

MALICIOUS

PDF

75.2 KB Created: 2021-03-09 06:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b29c560fdbbef2a11d192fec3eb8320 SHA-1: 1021917cdaaad92cfe38bdaa8c45d08c3af33143 SHA-256: d3687918d81d24672a33d23143dd704448d81569c1c1e2a30a0caa8fb0bb83a7
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 0.9993

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://seumenha.ru/123?utm_term=calendar+app+code+android PDF link annotation
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/soxulixafagidog-dijazaribedeme-kinamapukugoma.pdfIn PDF document text
    • http://degapituva.iblogger.org/norton_anthology_of_world_literature_shorter_3rd_edition_volume_2.pdfIn PDF document text
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/bedaturusebokav.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/ieayjbM/sorisikajajawegonipotesuv.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/1580645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_603d06e8cdd1d.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/hLNuibg/45248815895.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/3210756.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/8qIgijb/6810975205.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/ihhicjj/fruit_block_puzzle_legend_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/j4vmUW9/cruise_lines_out_of_new_orleans_may_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lozosasuxe/iiSGBxu/43089970198.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/c4LMiay/66222104233.pdfIn PDF document text
    • http://buboripixorezu.iblogger.org/applied_mathematics_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_60288d5b1aec3.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/6550135.pdfIn PDF document text
    • https://cdn.sqhk.co/lupananonutu/ajgKjaT/smith_s_near_las_vegas_nv.pdfIn PDF document text
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/tubasigixes_musuvitop_wazojane.pdfIn PDF document text
    • https://xisipoven.weebly.com/uploads/1/3/4/2/134266343/minuvibelotit_simulesugux_rebizikelulef_xigagefavem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fd798f6adb61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pajiridi.rf.gd/55285376183.pdfIn PDF document text
    • http://gevewodex.epizy.com/transpo_voltage_regulator_tester_manual.pdfIn PDF document text
    • http://vegunag.rf.gd/calendar_worksheets_for_first_grade.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 4792 bytes
SHA-256: 2d89987b474ac2740d83c36cb14a88699576ede7dfa06bbe2a9a53e14341fa77
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10276 bytes
SHA-256: f771360667466eb7f50be6eed3e23f947db217b42e8635f99401ffcb7b6283f8

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