Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb92147cc886992e…

MALICIOUS

PDF

73.8 KB Created: 2021-01-11 18:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5a8e201793cf92385d2902752403b1dc SHA-1: d8ca843d5d1d553edea8b7eb4d755c7fca669b80 SHA-256: bb92147cc886992e93b9e3cf9a91078315e1b401fc3b6c4467b77bf2e080d24c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious or SEO-manipulated sites. One critical heuristic specifically flags a link to a known malicious redirector. The ClamAV detection and ML classifier further support the malicious nature of this PDF, suggesting it's a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=android+tv+remote+control+app+not+working In PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/rijesenipur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fd840bee7506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f9d72c31dc6c.pdfIn PDF document text
    • https://site-1178369.mozfiles.com/files/1178369/ascii_code_table_binary.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/woburex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5fc296b425bbc.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/janawavudisekag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_5fbb1826666de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5f9e4fd22f016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5fde299f292cf.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/pajukovuxetu/personality_test_questionnaire_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/dawex.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/health_care_practitioner_physical_assessment_form_4506.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/besakefodekurorufiwimafo.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 5208 bytes
SHA-256: aa67ea9bad57aa28fb9e5558e25021cf0f198ea92222de59bb3f89dfcab9fef7
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 10340 bytes
SHA-256: d636e930b2a17dbab0896b15be068801e1b3595086159cb29f43e77b046f5b4a
font_02_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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