Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fc226084808f09…

MALICIOUS

PDF

78.1 KB Created: 2021-04-17 11:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff0b1cb9c8656eede3cef5199f59768 SHA-1: 0c4a00fa9f461aabd5c8328a338b1e7d028e866f SHA-256: b7fc226084808f09048339719969ed93bcc7225dd6106387c33d4d6973952966
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to drive traffic or distribute malware. The primary malicious URL identified is https://lozipotod.ru/strik?utm_term=artemis+fowl+book+summary, which is likely the initial point of compromise. While no scripts were explicitly extracted, the PDF structure and extensive link farm are strong indicators of malicious intent, likely related to phishing or malware distribution.

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://lozipotod.ru/strik?utm_term=artemis+fowl+book+summary
    • http://xijipeva.mypressonline.com/appsc_group_1_previous_papers_download.pdf
    • http://kuxakutefop.22web.org/adverbs_exercises_with_answers_for_grade_3.pdf
    • http://samafutanub.mypressonline.com/18048827596.pdf
    • http://paxezimusosesa.scienceontheweb.net/common_core_math_multiplication_examples.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e9209285-d923-478b-9b43-5ce0986985d1/pebajopukodaremar.pdf
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_c3fa9dab3aef446a820e4ed796908003.pdf?index=true
    • https://s3.amazonaws.com/gurafoga/nice_guideline_ischemic_stroke.pdf
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_a58641311af645429c42fe105b9991f8.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_c73a72bf84a14c9e95f383110cb2c027.pdf?index=true
    • https://s3.amazonaws.com/vosimalume/how_to_replace_battery_in_peak_jump_starter.pdf
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_029d0839acd349848e2de5b265863178.pdf?index=true
    • http://koxevopigi.epizy.com/sindhu_bhairavi_serial_ringtones_free.pdf
    • https://uploads.strikinglycdn.com/files/44d606c4-0970-449b-b094-3f9acc08ac33/do_lifestraws_work_with_saltwater.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_341781065ba44aea997124cbf7d743bc.pdf?index=true
    • http://jidabalelibixu.rf.gd/corey_wayne_online_dating.pdf
    • http://regujivabi.rf.gd/malayala_manorama_calendar_2020.pdf
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_fac99faaa3494f2baa5ffbe1cde18cf4.pdf?index=true
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_3c3cecbcebf1462abfd1f1c6639d3aa4.pdf?index=true
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_9ceb3cf155de4efa985bc28da4650814.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_c832f72711a04548a7b8f70ed66bf165.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_b16ed89b240a42dc810e41e0b629f7c1.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f597.bin
0af3cdc5bd1f56992754a79b1d4b8668c532cc8de614d27cc7f59a97f6d18d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 5300 bytes
font_01_sfnt_off0001079d.bin
a62245af8afd4b684fa2d8943613effdd8b0f754b8f9475b2283c971f204c5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10388 bytes

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