Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d05b53eef8275d…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 17:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d0852e64d501b4011f0bfb0b97d45448 SHA-1: ab13cd983096eb239c756684b33479dd4c1c023d SHA-256: c2d05b53eef8275d83a4bc987199d3fb849b5334619dbffd3de9a647b22411f3
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, many pointing to known malicious redirectors or disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or link-farming campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=is+sodastream+tonic+any+good In PDF document text
    • https://cdn.sqhk.co/baruduwege/hdigig5/86788283711.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/5NJlog4/wix_pricing_for_nonprofits.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/b627f8c82cb20.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/zVSibBr/15113021205.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/438596.pdfIn PDF document text
    • http://plsale.pro/80355419977m5wva.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/Sjcgfjb/gogojutukob.pdfIn PDF document text
    • http://cartest.pro/33170826846vggwp.pdfIn PDF document text
    • http://worldhold.online/20113231744cofqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416672/normal_5fffafd208169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5ff822da45203.pdfIn PDF document text
    • http://mybiol.site/nepivixotafugp0z6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_603497f5cafe8.pdfIn PDF document text
    • https://wipovatoz.weebly.com/uploads/1/3/4/0/134012317/862055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_5fcf3d2faff72.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/9be1465cdb.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/mozirolinitaje/69318194637.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 5268 bytes
SHA-256: 652bd23a76f0adb2480ad16293f1be0ae44278d4bf69e3d3ce108d4cf7bea1c2
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 11292 bytes
SHA-256: 382baeca9dd02cec4eed890f643626ea56ae4e934c2b9fe486e6f7e1d336e54b

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