Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a463222e2c1f61…

MALICIOUS

PDF

87.8 KB Created: 2021-04-17 10:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa1e7882556d86eb8f2e4ad65d46802 SHA-1: 113cfaba27580451eb3b144c9903528bed5a354e SHA-256: 38a463222e2c1f6113f8064e98c813da08fccd462077852858915a842909439a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as legitimate documents like 'free_annual_credit_report_gov.pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a phishing or content-farming operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=community+dungeons+and+dragons+online+free
    • https://cdn.sqhk.co/pananumujo/GKxficZ/free_annual_credit_report_gov.pdf
    • https://cdn.sqhk.co/sanojuxako/aQvhejh/kesasalitu.pdf
    • http://zoxodur.sportsontheweb.net/algebra_practice_workbook.pdf
    • https://cdn.sqhk.co/nilimijano/9CggEha/46730192022.pdf
    • https://cdn.sqhk.co/xegigujatefa/ianTpwj/code_editor_download_for_windows_7.pdf
    • https://cdn.sqhk.co/lazodadevab/Xfhbjab/35410419933.pdf
    • https://cdn.sqhk.co/kowipopi/ewiifhi/division_practice_worksheets_for_4th_grade.pdf
    • http://kavademive.sportsontheweb.net/69607547855.pdf
    • http://kedamijofulufep.mygamesonline.org/didigapelofo.pdf
    • https://cdn.sqhk.co/vovomafejuwa/g0icwia/romancing_saga_re_universe.pdf
    • https://cdn.sqhk.co/letareximo/hiG2Mji/kilawilijosoke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_78f46bace36b4ef7b307786aa0f9148a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3cbdbcf-59f6-42cd-ab1d-f2c0981ffc48/40391157314.pdf
    • https://uploads.strikinglycdn.com/files/786dff38-e5b2-4c08-bd59-85c1c322f3b7/82077898250.pdf
    • https://uploads.strikinglycdn.com/files/b8a5fa3d-bc04-4160-87a0-12c27ab73104/how_to_explain_opposite_to_a_child.pdf
    • https://s3.amazonaws.com/remeranexe/ruzafilejejazumo.pdf
    • http://fowakoleviwamop.onlinewebshop.net/62046365156.pdf
    • https://s3.amazonaws.com/semuxemakaw/timawilawemafamep.pdf
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_b666a9b7e5aa4fee98b5c2488cc32abd.pdf?index=true
    • https://s3.amazonaws.com/sasufufa/liwukivanatosowawu.pdf
    • http://zatuvejamubolo.atwebpages.com/philosophy_of_science.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_1a5f1b56ae56410cbc0a038643df9271.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_d9deebc43e3e4892ac72e0f21c755fec.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc8.bin
78305d1f7ada07b2f4bf2c5949ffa4db56414b827a88a3d00e2e48d13d6fd8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 5236 bytes
font_01_sfnt_off00011d82.bin
8946696ec33785ed7f2016b78e0216e541aeffeef1d7fd7c8ca53630599a53fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 11092 bytes
font_02_sfnt_off00014306.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14306 4324 bytes

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