Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fad340b0928cc1…

MALICIOUS

PDF

66.5 KB Created: 2021-02-16 11:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e6f3168e1e6f075da8ddb3863dff07c SHA-1: 146360c42ce54dbac79094d54314b41914c6c958 SHA-256: f1fad340b0928cc11cf90244f45e62274a14855347089a6eb881608d4dca97e1
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, disguised as a movie title. It also exhibits a PDF link farm heuristic, with numerous external links, many pointing to PDF files. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=liga+da+justi%25C3%25A7a+filme+completo+dublado+youtube In PDF document text
    • https://cdn.sqhk.co/fumamimed/0chbBq2/new_year_ball_drop_2020_performers.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/joYihC8/4121029511.pdfIn PDF document text
    • http://hr-insider.com/banal_nationalismfke0m.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/hcOjhjf/little_boy_haircuts_longer_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/1fbIeeJ/murder_mystery_box_subscription_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/VFgfjaF/50849018692.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/5011430.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/iiRhjZT/65171597615.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/cVggicp/55526323124.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/f6ec2d5f3de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ff3ccb8cc8e6.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
    • 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_off0000b67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67C 5596 bytes
SHA-256: e2035f7beabd76c171d77169692e386af6f1c63cd3a3690bea28060fc8ac6481
font_01_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 11120 bytes
SHA-256: 540a419abaca4d9e6507a93cf49e7da942a105810c7cd3b882ee34376804bd88
font_02_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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