Malicious PDF — malware analysis report

Static analysis result for SHA-256 d531b29edd761934…

MALICIOUS

PDF

77.3 KB Created: 2021-03-08 19:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 53fa1d1d2a0f563b9644caf064829e87 SHA-1: c0492fe44a861bb56e0261efe74eaae57f3220e7 SHA-256: d531b29edd76193457ff55d9f2afa86fc0be7239c1515c53f951f3819e78c488
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains fragments related to 'add item combobox windows form c', which could be a lure or part of a deceptive interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://nipisod.ru/123?utm_term=add+item+combobox+windows+form+c%2523 PDF link annotation
    • http://gratoraama.space/harry_potter_5_full_movie_cast6otpr.pdfIn PDF document text
    • http://devgm.design/what_is_the_inherent_nature_of_human_beingscyuiu.pdfIn PDF document text
    • http://pycnidwzxc.info/66066161564yakpq.pdfIn PDF document text
    • http://shothard.site/human_trafficking_organizations_virginia_beachr32at.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/dyson_ball_wont_turn_on.pdfIn PDF document text
    • http://yeswins.space/milexorevovalezuxodk0wko.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/81949894022.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/cants_5_form.pdfIn PDF document text
    • http://maxidadikegi.iblogger.org/45082489705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxawilel.epizy.com/girasedasevivoluwomajux.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_8a0413b67fc24f05a9ab59036884cd96.pdf?index=trueIn PDF document text
    • http://sipesazupijeb.epizy.com/missionary_baptist_church_trustee_duties_and_responsibilities.pdfIn PDF document text
    • http://sijopar.epizy.com/fireworks_powerpoint_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ecac3c-d445-4e49-8321-3445ce088aac/39521623536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7280aca-73c3-4733-a2d5-2e3ebc24c153/41871987327.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/35641814203.pdfIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_520d130baed9478a8826f4243589d8fc.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_3519755b5ba446e5b3a8317aeb311106.pdf?index=trueIn PDF document text
    • http://lafagelupuf.myartsonline.com/92554752955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f6916f-60cb-4937-9823-52afab6e64b2/xemiwomibuzixesowexojekax.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/whats_the_most_unforgivable_sin.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/bobojififid.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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 5212 bytes
SHA-256: 090cd6a39209c8469cf169feaaccb742305a670bc3274e3e861107972ff4b2a5
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 11272 bytes
SHA-256: d3f81408ce4ca16ed05748fc7eb95d28a02ec6e2bccfdb71c5d7a3e2ee27600c

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