Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4659b443b14fed…

MALICIOUS

PDF

80.1 KB Created: 2021-02-22 21:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4875fde98a71345740ddfd692af97a9 SHA-1: 563231755c4c173bfcad3bd7417cdceb27f3cff0 SHA-256: 4b4659b443b14fed03eb23109357f5c93ff4a0e2b287f2efd545e3c0b8de2f90
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, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=how+to+make+whitewash+brick PDF link annotation
    • http://homebig.space/49631020699k9d5y.pdfIn PDF document text
    • http://prizinsta365.website/fuxuwopupojuziredejvb.pdfIn PDF document text
    • http://winoraama.fun/silhouette_cameo_3_software_deutsch6v72c.pdfIn PDF document text
    • http://zoom-omsk.ru/47396020945hz5t5.pdfIn PDF document text
    • http://stassikorskyi.com/bamafudetegixufejizexj4ye3.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/c0d813aa102e.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/rufazaf.pdfIn PDF document text
    • http://savadaqwe.space/short_article_on_save_the_planet_earthh8oyr.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/suliveraguva_bewugeniw_lofimunuzotuzi.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/2323539.pdfIn PDF document text
    • http://idem-peshkom.ru/bikitaxemumurofuriba5353a.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/fotilana.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/7348524.pdfIn PDF document text
    • http://azorocheat1.xyz/acute_ischemic_stroke_guidelines6hmng.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
    • https://s3.amazonaws.com/dixaleko/rom_lg_l39c.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/full_information_about_computer_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/zitubi.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/android_api_version_market_share.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 4948 bytes
SHA-256: 9f9ee7ac67c5c8444896ebe99f369a9b7e968e365f85244d18925e664bdd90dc
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10432 bytes
SHA-256: fc3a8ee8a70f94d6d9a07e095bbe412ed730e20feee9091c328f887881231ba0
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16616 bytes
SHA-256: 25da4d0259edcb98e59a4fe79427651a73902f0cb209792fc7f5803c2d85b23e
font_03_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.