Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c26430592bda564…

MALICIOUS

PDF

125.4 KB Created: 2021-01-28 08:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 30d43010d9fcfb85f47e3adcdd7bb59b SHA-1: 653a9e2d7cd54a2cb615f6f09a40035d37deb0ad SHA-256: 4c26430592bda5643afc79ce54b47704d2eb03f5c9260d32d1036537c17c12e3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to leverage web content for malicious purposes.

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/123?utm_term=five+dysfunctions+of+a+team+online+assessment PDF link annotation
    • https://jujowaganul.weebly.com/uploads/1/3/0/8/130874338/wibavakajekuful.pdfIn PDF document text
    • http://astrology-personal.online/givipiwaroc51pn.pdfIn PDF document text
    • http://citimart.online/javascript_error_ipython_is_not_defhxdui.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fe4d63f57b9d.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/dce12.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/vanuweforexuko.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/detopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_5fd1a1d9c9645.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/dunakegisub.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/bizux_lagalegobiter.pdfIn PDF document text
    • https://warazafipa.weebly.com/uploads/1/3/1/3/131381481/7834b.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/1958884.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/5093111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/56031040562.pdfIn PDF document text
    • http://wukerakowevomu.epizy.com/mindfulness_meditation_for_sleep_guided.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/guild_wars_2_skill_points_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/buwawofotuwumowitoluk.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_off0001b0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0E3 5188 bytes
SHA-256: b53aa7b628dab1e3aaeca4498375d8ae5a035dd7ad452b69d0b7f45d0e80b78a
font_01_sfnt_off0001c291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C291 10760 bytes
SHA-256: 8647fcb71e59adee7354059f3f4ae01690b7a9aeb235616c6ec0ccefe319749f

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