Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d61c72337503fc…

MALICIOUS

PDF

71.1 KB Created: 2021-01-16 15:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d22fe440aeb691706650bbd1e6a56c58 SHA-1: 1f77dd5ac1d64e85a35ff792b4db5ba507133c74 SHA-256: 36d61c72337503fc31a8652685c088f65ae914295f25b3bda0b36024fb8c4514
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one redirecting to a known malicious infrastructure. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, designed to distribute further malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/wb?keyword=free%20download%20medieval%20war%20games In PDF document text
    • https://site-1168287.mozfiles.com/files/1168287/dairy_farming_project_report_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/jbjdUia/fijawife.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/bidabefimebumaboz.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/ZE99agc/80336780521.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/wingstop_coupon_5_off_2020.pdfIn PDF document text
    • https://site-1179658.mozfiles.com/files/1179658/medication_administration_for_nurses_book.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/e9fdede7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_5fb8f4acb2613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fa45edb15545.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/4526a.pdfIn PDF document text
    • https://site-1216697.mozfiles.com/files/1216697/bivorigupulisikanufomanet.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/kezemiradigu/48344666377.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/melbourne_laneway_cafes_and_bars_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/charyn_azitromicina_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/grinch_hand_door_hanger_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/j_vernon_mcgee_commentary_audio.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 5252 bytes
SHA-256: ea1b5586d88a418d7871e249c135df250f5f8cae5659dfa6b7176bd26409e897
font_01_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 10532 bytes
SHA-256: cc2bb411d56d88a24dba254cdb75e901e702a2e13eef7a3445ff455e05222b41

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