Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b646ef13f2414d…

MALICIOUS

PDF

76.1 KB Created: 2021-03-11 22:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 97e9f7a9c9043e93eff8e854e7b9ad0e SHA-1: 565f81631ce8feaf7ae0c45a71ce15d357bfd6a4 SHA-256: 91b646ef13f2414d437f437b764b82d7b9eecb74d1ba79f19f7c1881c30e45e0
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One of the primary external URIs observed is 'https://midufefew.ru/award?keyword=historia+albigensis+pdf', which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/award?keyword=historia+albigensis+pdf PDF link annotation
    • http://kugumadigiwo.iblogger.org/bhaiya_bhaiya_ringtone.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/paxokolades.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/ruger_p95_custom_grips.pdfIn PDF document text
    • http://xajaweronasuxo.22web.org/how_to_use_excel_beginners_guide.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_are_the_principles_of_design_and_their_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_e95f2acaf37e4be39a3bea8ad3069251.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ff8430d435db44d593b78053d177834a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41226354-d2d5-4ba8-ad58-0537e4089856/28474058860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc177419-2df8-4cb7-a90d-e66666acbd47/soap_web_service_client_example_in_java_eclipse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8e953b-032e-4883-8999-f9ad605c2c21/what_is_the_characteristics_of_an_argumentative_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bebd63-1021-4291-8460-600f55166d55/how_to_turn_a_picture_into_an_oil_painting_in_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/philips_avent_breast_pump_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/41811438683.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/13354159420.pdfIn PDF document text
    • http://netasok.rf.gd/how_to_light_reliance_606_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14570157-a2e3-4105-bdd4-0d9f8673f89d/scosche_loc2slsd_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af2e15c-e35b-446b-aa1e-558655ea028b/waketor.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/7469587047.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_a96895231de94c058eee0cc49043e0c4.pdf?index=trueIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/list_of_regular_verbs_in_english_with_spanish_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9f54ff-d01c-4369-95eb-0006abadee59/dekegadomenomipe.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_d5723fa2045d4291a105f35610c16c34.pdf?index=trueIn PDF document text
    • http://lejapanuvijul.rf.gd/28628812124.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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 5308 bytes
SHA-256: bb97e4656c44267a3587336ebe6f06de31c0e938966950bf6e3f0c79d2a05443
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 9984 bytes
SHA-256: 447f948a9b4048900e86dc0a80195ea1dc0ea7264960beef5496096fc5c4fff2

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