Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a92d24e8418e469…

MALICIOUS

PDF

100.3 KB Created: 2021-05-15 23:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 862ddd10b0c369dd6448e5f8c4e8420e SHA-1: 1bbec60bc552b84660b29bc3dc0f97574edaab11 SHA-256: 2a92d24e8418e469172ed8b112b24e5f799e0d9fbc7ac7637c8ae0e2d4eab71a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of a large number of external links, identified as a link farm, suggests an attempt to direct users to potentially malicious websites. The primary URL identified is https://zajinet.ru/strik?utm_term=browning+a5+ultimate+20+gauge, which is likely part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=browning+a5+ultimate+20+gauge
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5ffe1b7fe9f7b.pdf
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5fe95935ad9d9.pdf
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5ffde11b8577b.pdf
    • http://fogatevemawe.22web.org/guruzerabivufil.pdf
    • https://cdn-cms.f-static.net/uploads/4447267/normal_6055b56678ed9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pujupapisosu.rf.gd/gaxed.pdf
    • https://s3.amazonaws.com/vuxagixil/bokisixi.pdf
    • https://uploads.strikinglycdn.com/files/b0c44cd6-cf75-4fdd-9535-0b6088cb1769/are_graham_crackers_dairy_free.pdf
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_84b5d91321a64d3aae354a77db44c9cb.pdf?index=true
    • https://s3.amazonaws.com/muxegeza/tepejeloguxizeragagixef.pdf
    • https://uploads.strikinglycdn.com/files/1c143c9c-74dd-48e8-86e1-e3d4b4c73aa2/4049980441.pdf
    • http://bafebus.epizy.com/57027844315.pdf
    • https://uploads.strikinglycdn.com/files/84d1e5be-59fc-44ad-a24c-5fe042c216f6/what_is_the_elements_and_principles_of_pyramid_of_giza.pdf
    • https://s3.amazonaws.com/serogajugomiji/activator_for_windows.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_eea4daf3a48d4e60ad684e0a29abf64d.pdf?index=true
    • https://s3.amazonaws.com/sazariwapa/fefezadimujoponupi.pdf
    • https://s3.amazonaws.com/fulazelof/how_to_set_timex_day_date.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_bd9ecc47ab314b99af3dbf7ab14db38b.pdf?index=true
    • https://s3.amazonaws.com/gomakobez/free_cease_and_desist_letter.pdf
    • http://gapolofivevos.epizy.com/irvin_yalom_when_nietzsche_wept_review.pdf
    • https://uploads.strikinglycdn.com/files/9ae86a0b-2baf-4bcb-8b60-693b12b44c10/46420307818.pdf
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_456a4d5eed4349bbb7e028f794d71373.pdf?index=true
    • https://s3.amazonaws.com/vizegemawokaxe/aparichitudu_movie_songs_free.pdf
    • http://piwuzodoxomox.epizy.com/94049055596.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_07e3de4b4da44ed3b4c32b9029002d96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d407389-2fc4-4dba-a6e5-1d02ee67ba52/28009997504.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142af.bin
85ca322e4fadecf31b7ecaa60ef74aef90fda112794442256e85b0db9b384d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142AF 5364 bytes
font_01_sfnt_off000154f1.bin
3b3ab16bbe0bb36c279b36ba2e920b6e2c32de85e1733b57de9c3e563d830e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154F1 14576 bytes

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