Malicious PDF — malware analysis report

Static analysis result for SHA-256 a373f3f8221d8cca…

MALICIOUS

PDF

76.8 KB Created: 2021-01-01 22:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db2cc65ed607eaa75cd8f1575547c04a SHA-1: 1b8eb510891eed278d95b0fee33aef048b0f56db SHA-256: a373f3f8221d8ccac89703d077bf3b1d5abaf773a9a48a523fb8d9adbe4b0006
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including linking to known malicious redirectors and containing a large number of external links, suggesting a phishing or spam campaign. ClamAV also detected it as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

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/123?utm_term=pdf+js+fingerprint In PDF document text
    • https://cdn.sqhk.co/mepawoworu/Eaja8jh/billboard_top_rock_songs_of_the_70_s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5fa42b92243be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5fa428f3736e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fc62039d8b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f9648c24c7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/XUhuDBq/summer_camp_staff_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fc37a4c00714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fda04ef33543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fa6b21d7a38f.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/goramunomirubovibok.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/jcididg/fast_charging_mobile_2020.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/matogapibelifiv/vikirumigu.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/37870034138.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5044 bytes
SHA-256: b93edae73910d0c10f976ec4dd1312446226a92de3dbd560d48897c1f73e0801
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 11544 bytes
SHA-256: bbd4d4569fb8e9047ade1b53ffb187586d519a2b511ec3445e63475c76b1ce30

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