Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a64407d81d1b2b8…

MALICIOUS

PDF

75.9 KB Created: 2020-12-09 22:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 77838ba4b27c4b208ff2eb72959cda40 SHA-1: 5dd3de3451727d0747c911de2e2658210221cca3 SHA-256: 6a64407d81d1b2b8310d679619becee1b99fde80cb5fc3df3f86cdc907debc81
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to "Pwc inductive reasoning test answers" and embeds a URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=pwc+inductive+reasoning+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8713613c4d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374203/normal_5fcc2ab1d06ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8921e484269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fc396940274e.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/980d8a84-96d3-4031-9b84-4fe7da40bdee/11957025760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b762091-d5bb-4563-a0f9-e122b38ee18b/llc_accounting_for_dummies.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfbc48cb11b25c09beff2/1606220741070/how_to_unfollow_everyone_on_twitter_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/bowiduwinasikagikuxas.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/24759963131.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc520b37848ba205d341ec0/t/5fce48f824c49707d34da914/1607354618184/puxek.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/binomial_table.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc140d917e7202640ec8ca0/t/5fcd0782eb18547f4b8878f4/1607272323326/free_pictures_of_mars_planet.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5228 bytes
SHA-256: cb5409c90ed239baddd21403685b7117258e1015ef86fc9d884de5704ac0d8d7
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 10832 bytes
SHA-256: a0a118d131e495917bf02ff456a4a78529215bc23bc66f5caf174cc0c215c054