Malicious PDF — malware analysis report

Static analysis result for SHA-256 991da0d22bd25580…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 18:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 565b593a9356eb1e16f455873e16ad51 SHA-1: 1e222527bb047db0999195a2a2239720386daee6 SHA-256: 991da0d22bd25580f2d6624fd668e7130207382be35ccf65be29fa7260ab4b1c
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/award?keyword=bosch+automotive+parts+catalog+pdf'. Additionally, a 'SE_CALLBACK_LURE' heuristic indicates the document may be designed as a callback phishing or tech-support scam. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of a malicious URL and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bosch+automotive+parts+catalog+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_60394349c1d6b.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/ihZihhj/busobopagudelowope.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/bOwHpje/lowisifaduzefegubowovu.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Ahgl88z/nilimimetokiwedenu.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/jfC5hha/bitiritago.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jsgihgU/67558596681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5fe94a3662b9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_6006316ca8e6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_60087ba2e567c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_60430999d13b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_600a49f54ed0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fdf2e15ccf1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dozore/11039083113.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/1081932019.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/adjectives_ending_with_ly.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/13343436104.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/stem_and_leaf_plot_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2409c8a3-b565-43e3-b0d5-d7f300195df5/hp_laserjet_3055_scanner_driver_for_windows_10_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/domemalajutixozelun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96747873-d9b6-492a-9dec-78891c0c61a6/volume_of_cylinders_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/canon_700d_vs_650d_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefd6c9d-5bc9-492c-949e-23cdbee0813a/75915952663.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/platform_block_heel_lace_up_ankle_boots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa45e0db-c679-499a-a90c-9ce6b0ec40d9/bumovalenopokev.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/estrategias_de_afrontamiento_en_adolescentes.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/bazopipegafenipakapad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 5456 bytes
SHA-256: 3b4e5c63e2919edd37bf8c4bc4ffbd5803a97108c3a791b763f08b0c5817065e
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 10152 bytes
SHA-256: 201a69b0e49ca265bedfbbeb9b5772d00998ca9a3fc7f8493b4af7486c775986
font_02_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333