Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a00ccbbfa55bc0…

MALICIOUS

PDF

80.4 KB Created: 2021-02-13 17:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 74babe5f588ed2961e1989d33cacf227 SHA-1: db5af7aca2952f8976fc739b4924f8850cb16a9e SHA-256: 09a00ccbbfa55bc0d0f5b8915bb735c5631406e79fac1897eeb171b840527c1c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to disposable domains and redirector infrastructure, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=touch+requires+at+least+two+sensors In PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/gehhhgj/remuxuwemowebiwamilize.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/269fc98.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/7660471.pdfIn PDF document text
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/1972624.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/jisotisivowuge.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/6832190.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/jcziiKW/4_pics_1_word_6_letters_clock_stopwatch.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/ghBhiVC/42515245592.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/N82BFii/xowobokiwositake.pdfIn PDF document text
    • https://vefurubaturuxal.weebly.com/uploads/1/3/0/7/130739777/menuxekaxowanul.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/if00jay/social_media_viral_video.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/topiwakekaxez.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/wibazif-rikedazabev-vafemifosak.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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 5056 bytes
SHA-256: e168b5fbb7bba2162051700f921d51b5c99029c6ed1d6babe533defe74119ad6
font_01_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10780 bytes
SHA-256: b64c0b597b6fc2c8d926290f505d51e8e5f1e2461b54f15052f837fc7794efec

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