Malicious PDF — malware analysis report

Static analysis result for SHA-256 758343fdacbd8f57…

MALICIOUS

PDF

73.1 KB Created: 2021-02-21 04:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 471472f9a96f97b0bee8cf71e353ec11 SHA-1: 763d08aea816e70a2e5faac6addbf952b2f3ec54 SHA-256: 758343fdacbd8f570ff79f4b548269d7f0d534b0e724889e787bcc0bd60ec7d9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. 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 links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/123?utm_term=2001+subaru+outback+sunroof+wont+close In PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/jugefomojotoxis-temenibodutolo.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/razuvozifum_giwomune.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/7032209.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/hdxhaKi/dungeon_archer_run.pdfIn PDF document text
    • https://gatakuluva.weebly.com/uploads/1/3/1/8/131856326/8468570.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/y1U1Ljj/moluxovetetodepol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/fcm_notification_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/through_digital_platforms.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/chevy_volt_evse_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/biuret_test_journal.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5400 bytes
SHA-256: 5a20a080b3fc13df00b37502b507795406b418d2665ef6733fcb21eae8e3d366
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 10776 bytes
SHA-256: 1bbb13d97fc032482cc459d03697a881c34c38d79711f3da53c7393c42a1dcef

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