Malicious PDF — malware analysis report

Static analysis result for SHA-256 af079ea8a4c188f4…

MALICIOUS

PDF

78.3 KB Created: 2021-03-18 10:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2045ee52236e4b389b4e2bc81da31717 SHA-1: bf5a73e488be8bd489b33df947034f59f26f9991 SHA-256: af079ea8a4c188f433d86e2cff4c66b6623b2b3a8d70924463a67f970a6d3e66
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'dafemum.ru' and a query parameter suggesting a lure for 'barcode producer free mac'. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm nature suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=barcode+producer+free++mac
    • https://dagarodidosuva.weebly.com/uploads/1/3/2/6/132696056/6168226.pdf
    • https://maradezeg.weebly.com/uploads/1/3/5/9/135974492/7863335.pdf
    • http://jimubezisu.iblogger.org/esl_worksheets_verb_to_have.pdf
    • http://beruvutekimeged.22web.org/powovipevezumez.pdf
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/sonigesademe-zutesut.pdf
    • http://jafalule.22web.org/mastering_autodesk_revit_mep_2016.pdf
    • http://nuraner.iblogger.org/define_chief_information_officer.pdf
    • http://mizikekow.22web.org/71771748671.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mibaxeruwo.epizy.com/54519304084.pdf
    • http://bikutuvuxaxixo.epizy.com/purujegoxezeratifizi.pdf
    • http://zuwosopawekaz.rf.gd/bolumininavasuxefezisosez.pdf
    • http://jevitof.epizy.com/goodman_fielder_annual_report_2014.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_7a00f05a0e5b4f089c308a7cbc2836a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/555645a5-ca51-400d-8c1d-5a0d30bd44e1/gigesabifiroluj.pdf
    • https://uploads.strikinglycdn.com/files/a93ce005-d428-4230-a697-4a7896ab7800/where_can_i_buy_a_playstation_vita.pdf
    • http://simavanexija.rf.gd/nigewemigidorimixiderixo.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_2430963ecbf142d596b25be190446e36.pdf?index=true
    • http://wojotefeva.rf.gd/45060507899.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_8987b0e9a81846a5806d397559df8c08.pdf?index=true
    • http://wubavon.epizy.com/happy_birthday_song_punjabi_djpunjab.pdf
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_f8bb8975e46247c58e840e5abb517e4a.pdf?index=true
    • http://sokexodine.rf.gd/76324123959.pdf
    • https://uploads.strikinglycdn.com/files/bf34f547-229a-4308-9afe-ae1a444e34e5/38636999077.pdf
    • https://uploads.strikinglycdn.com/files/78a72648-adff-4f4a-9d54-daff8949ae81/guvitoponosif.pdf
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_19805bf4578040f3bd5ba10900fa1ca7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3eef61e6-723c-4b47-80d2-b311553904b5/how_to_train_your_dragon_3_characters_wiki.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_off0000f4dc.bin
f9609603b7dd63304cb63aeb4ee730de9e217989a14d13893920d405ab5f2857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 5140 bytes
font_01_sfnt_off00010644.bin
8c63b325fbba9bfff415aa952a7c03e5acd897e2c21a28d8486a060ca318bd34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 10768 bytes

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