Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8488b127c6d2fe…

MALICIOUS

PDF

76.2 KB Created: 2021-05-17 12:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b43fa2f9d9769ad21190f486b2e997b7 SHA-1: b5234a45cc348b01e7668543c0dc9ed73d4c5429 SHA-256: 7d8488b127c6d2fed6032d6e59ead6525d1c720f39a608149fe44e553fd7042d
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and a link farm heuristic firing. The document body, though heavily obfuscated, appears to be a lure related to health topics, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=what+heart+problems+can+cause+high+blood+pressure PDF link annotation
    • http://richteam.site/how_much_is_a_husqvarna_450_chainsaw2kbqb.pdfIn PDF document text
    • https://xabifiwalutoku.weebly.com/uploads/1/3/6/0/136085939/024927e8a04.pdfIn PDF document text
    • http://successinyourlif.website/cece_winans_waging_wardq4na.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/woboku.pdfIn PDF document text
    • https://towutibe.weebly.com/uploads/1/3/4/0/134012467/d3c64.pdfIn PDF document text
    • http://gazozaxuk.getenjoyment.net/systematic_theology_1.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/viboxogodavu.pdfIn PDF document text
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/5943609.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/jexumixafa.pdfIn PDF document text
    • http://blaugrana.ru/18277284838330bs.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/authorship_of_pentateuch.pdfIn PDF document text
    • http://jugapus.sportsontheweb.net/around_the_world_in_eighty_days_book.pdfIn PDF document text
    • http://getcreditcheck.info/82568330708f5qkn.pdfIn PDF document text
    • http://summerita.fun/4214045653015c8.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/42846abb-566e-41e3-9025-db0d5779a75b/dieta_alta_en_grasas_y_proteinas_y_baja_en_carbohidratos.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/kebulafazag.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/injury_report_nfl_week_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7598030-5e2b-4b99-815d-fd72ccc380fe/35302461903.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/20048397591.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/pajoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/how_to_use_milwaukee_m12_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/booking_form_html_template.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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5640 bytes
SHA-256: ef389c0b8b84dbdb20a6e472965707fa0b815d8de148a25e9e754888c735adb7
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10708 bytes
SHA-256: 065d31f83a5f1ab58a2a0ad6127c5987eac64148fea6d7dd0e8ec48499683936

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