Malicious PDF — malware analysis report

Static analysis result for SHA-256 52987f96bf3e1d27…

MALICIOUS

PDF

71.3 KB Created: 2021-03-13 23:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f6caa01e9c651f9f4d1f23470e085d2b SHA-1: bcb2f2cfa572249d5f39ea6c6065c781d0c1d31d SHA-256: 52987f96bf3e1d271a811291a04bf0d22181a55c84d4d93a2cab28d7c5c13334
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to external URLs, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/wix?keyword=calculus+bc+section+1+part+a+answers+2008 PDF link annotation
    • http://help-igcopyright.xyz/47061605554aib4h.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/98393339043.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/aq12Cgd/red_ball_garage_manhattan.pdfIn PDF document text
    • http://ipoteka.net/wizomevotafeplo1y7.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/where_to_buy_blood_bowl_miniatures.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/figopeket.pdfIn PDF document text
    • https://cdn.sqhk.co/logulemuset/kjcJ7eu/aldi_weekly_ad_mesquite_tx.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/tesafitafasosazizuxo.pdfIn PDF document text
    • http://esmoney.site/tisiremovepewi1l5pk.pdfIn PDF document text
    • http://complerbnp.com/la_orestiada_analisiss14n4.pdfIn PDF document text
    • https://cdn.sqhk.co/kozosorole/aSmjbyN/58076300828.pdfIn PDF document text
    • http://top-agent.ru/western_civilization_spielvogel_7th_editionxidmx.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/gagegawo.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/uIWljiA/88235872824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11278528-8069-4fdf-9469-cc715488482b/48697839103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68843703-0a56-45f6-a18b-f9a21b433010/2575767761.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/brazzaville_beach_william_boyd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14acc737-b6b6-4dca-b4aa-1822e8a95b90/fresh_mechanical_engineer_jobs_in_oil_and_gas.pdfIn PDF document text
    • http://lipeporo.onlinewebshop.net/neurological_disorders_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/71648142845.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/best_homemade_juice_for_weight_loss.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/mupakop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b1be03-89cc-40e5-83ab-a0169ab5780e/zogevosekure.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/intermolecular_forces_liquids_and_solids_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bd1da0-7adf-4fef-a445-dbaaa0e78609/how_to_test_smd_transistor.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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 5584 bytes
SHA-256: f8eddef6335559ac12fb883ce616b4272cd5a358c00744b252ef993e5f5b9db7
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 10768 bytes
SHA-256: 39f2ed6c3a702ed61c5aa63c62e8e860de406df6a5119785b9ffec3da5e8c32d

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