Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a5eccc1b7ddcd8…

MALICIOUS

PDF

82.3 KB Created: 2021-03-12 16:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aab584b75cb94790fc5299587be81cf5 SHA-1: 939dc492805c70c91b72b2f81e9a26af4bdeb62c SHA-256: 97a5eccc1b7ddcd87e638ee8d56ecb9338a1e5694e492a90602ed838e1ef04e8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=chemistry+lab+assistant+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408594/normal_601a384512257.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/givafovumokokukeluva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_600e96315fe36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_602e531875573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6045deb157049.pdfIn PDF document text
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/rotururudajaj-kawedogubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381762/normal_6003f1d01aa1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_60378625a8a35.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/what_electrical_wiring_is_used_in_homes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/lawul.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/how_to_use_cuisinart_cold_brew_coffee_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/80424081932.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/python_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/how_to_make_easy_waffle_mix.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/lenovo_g50-80_screen_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/valorejunepag.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/25136075534.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/blender_2._8_scene.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_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 5488 bytes
SHA-256: b7521ff12d7301a717f8204eea682fd8172138468908169ed8a3e5bc668607b0
font_01_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 10924 bytes
SHA-256: 1722c9a6813598a31804bb3289cc3e7e14f14de306a9fcfaf8b5ae50650c304b

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