Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded54f6b7093cc47…

MALICIOUS

PDF

100.6 KB Created: 2021-03-23 00:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 36d0de6fc57c9b79537d93e13dfffe60 SHA-1: 6a81b1c965f2deacd154b9253891d93a168796ab SHA-256: ded54f6b7093cc4708cb6f2fa7657e2f534dd3d168936113bfd24c097eca7266
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains multiple heuristics indicating malicious intent, including brand impersonation for credential phishing (Microsoft) and a callback lure. It also hosts a large number of external links, many of which are suspicious. The ML classifier and ClamAV detection strongly suggest this is a phishing document designed to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/dcf4ca318761f9.pdf.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/123?utm_term=ei+maternity+leave+bc+application+form PDF link annotation
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/dcf4ca318761f9.pdfIn PDF document text
    • http://profyhouse.ru/how_to_understand_my_echocardiogram_resultsvv51j.pdfIn PDF document text
    • http://getplafond.xyz/english_grammar_testaocx1.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/654746.pdfIn PDF document text
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/938476.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/cc7ef35f-8f75-4e54-8203-fc9d85a9a757/emergency_short_story.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/49092045145.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/us_navy_training_base_in_great_lakes_il.pdfIn PDF document text
    • http://worurekebisur.rf.gd/belajar_microsoft_excel_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/diono_radian_3qxt_dimensions.pdfIn PDF document text
    • http://mosakokomu.epizy.com/reddy_heater_35000_btu_kerosene_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82b359c-67a6-4a16-b286-55798c3455f9/recaro_performance_sport_combination_harness_to_booster_car_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/calibri_font_css.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b91885-a698-41c3-b9ec-abd88b301193/play_the_game_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c524649-9732-4c29-9f8d-5177cf803147/dd_3.5_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/what_is_grounded_theory_in_nursing_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ed72dc-f878-4e4b-8475-6ec88445c393/xinivogolumej.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/99190810228.pdfIn PDF document text
    • http://zadesejofugo.epizy.com/c_s_lewis_livros.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/33268564992.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/arturia_keylab_61_manual.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_off00014c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 5244 bytes
SHA-256: 90732019db62b5e785b8804045f2d78732086018bd1dac2810d7de42f73cc8b2
font_01_sfnt_off00015e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E59 11464 bytes
SHA-256: a90075c9d3144dc132267a48c9c4f55cecc4248178efba6e22f48290c3d24a66

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