Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad6978040264966…

MALICIOUS

PDF

76.3 KB Created: 2021-04-16 20:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73da281c633891e8d2f7b6cc0447ca12 SHA-1: 298ede7c4db5fd2db626a9dd770052612cb82119 SHA-256: 2ad697804026496676c2a9073d649c2ab27d17456b847fcd2d05dc44d1240663
166 Risk Score

Malware Insights

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

The PDF contains multiple high-severity heuristics indicating suspicious links and a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were extracted, the embedded URLs point to potentially malicious content, and the document body's garbled nature suggests it's not intended for user consumption but rather to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/strik?utm_term=how+fast+is+the+netgear+n300+wireless+router PDF link annotation
    • http://kadabafomelu.66ghz.com/security_risk_assessment_and_management.pdfIn PDF document text
    • http://uplrezina.site/happy_birthday_cake_name_maker_online9bou6.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/synchrony_bank_old_navy_contact_numberxt8oq.pdfIn PDF document text
    • http://flylovel.com/100_multiplication_chart2vc60.pdfIn PDF document text
    • http://amsidgi.xyz/23200462345qmkz3.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/bujatojederem.pdfIn PDF document text
    • http://classkaod.ru/boohoo_meme_funnypbky4.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/981fbd568769.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/nozojukanuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e0d4ce-222b-4718-bf69-bb3cbbe36fc3/zavazalabamabadudufet.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/59032835177.pdfIn PDF document text
    • http://xedekig.rf.gd/manual_do_proprietario_citroen_c3_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa00943-0be4-437d-beca-0c1ddf6a7e5f/bipowegafepadekokiwumu.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/parental_advisory_logo_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/37179192173.pdfIn PDF document text
    • http://rirazito.epizy.com/54265743584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad3c397-37dd-41e5-930f-97c0cf07b3af/how_to_reset_your_voicemail_on_iphone_11.pdfIn PDF document text
    • http://kotopogo.rf.gd/formal_dress_online_shopping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702110e4-c2fa-4377-9f3a-cd93c1f569c3/54333550773.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/designation_of_health_care_surrogate_template.pdfIn PDF document text
    • http://tolojusoju.rf.gd/freckle_juice_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e88f0e4-143b-421b-8cf7-f24d36194acf/romeo_and_juliet_act_2_scene_3_stylistic_devices.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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5388 bytes
SHA-256: 3bd032a2ef95c1d456ee00b8b66f35802682d852f61d2727bff0dc2d9eb6e00e
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 10440 bytes
SHA-256: 7ca864386f8d6ad86682942cd5baea9c62bb0b1237b3cee065ed3909d344e3cd