Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1f75d777a578fc…

MALICIOUS

PDF

78.2 KB Created: 2021-02-05 12:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c0db13a2e5105991b5d26887ac69ca66 SHA-1: 95bc1e5918250b341a36e2c644d8448ad16e5ef2 SHA-256: 3c1f75d777a578fc04d6ef7cb25965edc870a358a77cc313f2f5edf5ce81a14e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://druttle.ru/aws?utm_term=king+of+chalices+tarot+guide PDF link annotation
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/08b909d6.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/niwewi.pdfIn PDF document text
    • http://goproonly.com/2007_chrysler_aspen_navigation_manualqco14.pdfIn PDF document text
    • http://wejutejejuwow.iblogger.org/65431058792.pdfIn PDF document text
    • http://medyahanem.com/best_adventure_motorcycle_tires_for_sandqyrse.pdfIn PDF document text
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/7e8a2536.pdfIn PDF document text
    • http://zobebukore.22web.org/astra_international_tbk_annual_report.pdfIn PDF document text
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/lakoxa-juwegekow-mobofizolov.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/jizatob-binoj-wusuboposi-lipajitake.pdfIn PDF document text
    • http://uuuuull.space/might_and_glory_kingdom_warbot0z.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/sosetupidigilolekobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dunizolosonon.rf.gd/baixar_o_foxit_editor.pdfIn PDF document text
    • http://lugukejuraxa.rf.gd/fukagenupisokojewul.pdfIn PDF document text
    • http://fejusadifidexi.epizy.com/22977254408.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/bamboo_sheets_king_size_bed.pdfIn PDF document text
    • http://zitosorav.rf.gd/52857949645.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 5136 bytes
SHA-256: c3c9a4049659f22fba1a6f356562e5045eb809a57d202226d4298c87831a20b5
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 11608 bytes
SHA-256: 01cf9255238abdd141e81945ad8ed339a1bb9f02d9f73dd200d37aa7b4154687
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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