Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a7d73867bed900…

MALICIOUS

PDF

77.1 KB Created: 2021-01-26 03:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e5ea49a30b7129130db73002ac0ef28 SHA-1: c09ae9060b757ce50a6e4bc8a09bf69978cac2b2 SHA-256: f3a7d73867bed900b1d9787a7cbe9133fa530d66267e2ddeb8c53b0c0d6d3c8d
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 the primary URL identified as a known malicious redirector. This suggests the document is designed to direct users to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

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://crophysi.ru/aws?utm_term=apa+citation+clinical+guidelines In PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/8261240.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/ggmhehj/tiktok_apple_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ff94dd90602f.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/4e78d9ceb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_600af692918b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fd0ffaec2726.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/Tijgdii/turbo_price_in_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/vjeEWjc/lokekagap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fe7f77189d6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387699/normal_5ff17eae195c9.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/5b1303a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_600d7ef4eb6cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388060/normal_6004402949c77.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/9Xzzkyb/niroximakekinimepipur.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/gghj2Ba/tasty_time_with_zefronk_blueberry_pancakes.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/IEUjhhj/dth_recharge_app_all_in_one_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5ffc5419db59b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5fd0e99a42191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_6002befbe1c06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 5132 bytes
SHA-256: 00da8b8c86369c56bb8be5e6d20c4fe55c0ccb17bcef6606b6f6a04512ed1218
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 10512 bytes
SHA-256: ce00051c57a78d8a66ea4f5b0f5e00d425bdab8defcca1cc3458c23eb65bdfda

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