Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b51141fa3cefde…

MALICIOUS

PDF

78.0 KB Created: 2020-11-11 03:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7c597f44846d6d1be6ba8f8bcc18c8b0 SHA-1: 7666d782a5f6566fb467c2bc7628e13b344590bc SHA-256: a1b51141fa3cefde45d8f5e20a2da8e04e30460bbace41ce583dfd995f5ac15f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to 'Hackers manual 2019'. The presence of PDF_URI and EMBEDDED_URL heuristics indicates an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?keyword=hackers+manual+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f8ac05a298c5.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://uploads.strikinglycdn.com/files/61ce1dff-9818-4e04-89b2-61a470f2a50a/turawolixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c781aa06-0193-4aaf-a963-1b8fef227002/la_hobito.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/santa_monica_college_classes_summer_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a22b4d-3425-4724-b0e8-e5a4b3e16130/hunter_irrigation_controller_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/6277277017.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/83635548175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c58297f-65cd-417d-91f8-6b2b081bc574/baxikovifimaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63dd680-8faa-4086-a264-9fd09e0833be/nuxolarokikavizoxunaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d00846-7d72-4b82-8f8a-e15d1722dde7/jazabakoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1c1658-b709-4ecc-9241-42fb55feceb8/zomuguxenudekejan.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/7369689258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce62aff3-2981-4547-b2c7-aa65e698f88c/65179570586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf11a94-edd6-4129-a170-ee60b6a96099/gemexerisajefuvumos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82cc3af-3eac-4552-8ebc-5f6b186fd56e/the_new_mutants_2020_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfe0bdc-dee5-49a3-9603-58c12fb39130/fuwone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf2bb30-6788-4771-b8ee-88fdbf5c8569/xifab.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_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 5096 bytes
SHA-256: 027a272a720054a9db2dac3587d7cc09b90cdd8c56a0158ae9f7d4bb8ab7a888
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 11212 bytes
SHA-256: 5b7158673ac2c3566f617d2336ecff0ff67ef87ff9bd658770d38367644fd1d5
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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