Malicious PDF — malware analysis report

Static analysis result for SHA-256 5556bc42b2f5bb84…

MALICIOUS

PDF

82.0 KB Created: 2021-03-24 18:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e09098d93ab60066ff95e5633d336c64 SHA-1: fd3b85963e6151cee51353ecdb75850bd3eb4f3d SHA-256: 5556bc42b2f5bb844086053abd71f99842fc50f7b3cf88afc67b8d0eb14c67c9
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or phishing. The presence of a link to 'maypoin.ru' with a 'tax return calculator' keyword, combined with heuristics indicating urgency lures and a high ML classification score, strongly suggests a phishing attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/wix?keyword=2020+federal+income+tax+return+calculator PDF link annotation
    • https://cdn.sqhk.co/nujusowidom/UjfJ6ib/91427683330.pdfIn PDF document text
    • https://cdn.sqhk.co/vikaxokaso/olAjfih/emirates_flight_521_report.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/free_modern_cv_template_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fogizotufijo/gijjhhl/96392347630.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/hhbGhg5/dedisetixexobupidofa.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/vigDHID/nhl_playoff_picture_2020_dates.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/d4121169-824c-4f1a-b696-09d43c9f9c89/60309730491.pdfIn PDF document text
    • http://bejofumojep.rf.gd/tarjeton_anticorrupcion_colombia_2020.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_1beb00170cb741eba9fbc8664f8801d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/hillside_school_district_93_report_card.pdfIn PDF document text
    • http://tazomibege.epizy.com/kekuwuninepudigajogum.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/apush_period_2_guided_reading_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/82491008779.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/73401862989.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/57307834002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab632e0-6db5-4180-ae73-5f99b5e86b52/what_is_5c_code_on_samsung_washer.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_988b024ed0a4409aa75aec7c2efb987a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2dad58-3f68-4a99-a1eb-7ae3ce949885/wegebafibesevez.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/dazupa.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_faccc1dbb9c948cf8e66b0805012a17c.pdf?index=trueIn PDF document text
    • http://toduwez.epizy.com/pink_floyd_easy_piano_sheet_music.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_b9c46a8026ae46519a4e2c5e904fb137.pdf?index=trueIn 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_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 5236 bytes
SHA-256: 1e17388790aa5fcbd5461ec07ade757769528d5f084149ddd69550d0258b5182
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10896 bytes
SHA-256: 02c599b52b10f381c846b783070da24d8089bea401339afee91dc5daf0c27883

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