Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0a72f854c95c8c…

MALICIOUS

PDF

80.8 KB Created: 2021-03-08 10:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d28c57fbdc251a3c32a831dfefa4ece9 SHA-1: 95171b07f5021dfab339f9b8b04d7601931e80cf SHA-256: cf0a72f854c95c8cb270f7886a966df0ea0caa4dc4a1d9f417a6f6cfef16836f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and URL distribution 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://crophysi.ru/strik?utm_term=what+is+educational+psychology+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_60265fe0d3191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fdcead41f25b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417118/normal_5fec857ba19e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_5fdf36657e3ee.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/gcXpia3/86688375925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5feec37c9e915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5fd84e8841f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_5fd2afb7e3ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_6021614a4aaf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366302/normal_60055ac16993e.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
    • https://uploads.strikinglycdn.com/files/82eeb8cd-924d-49dd-8e53-42551d9c44a0/could_luffy_beat_an_admiral.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_cbabe7f47ae34c64b8c1b2777277dc1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4211e9b8-7b2f-4517-9901-bdd909346cb9/nirubatavevufovabitazuk.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_d2ff9ca6d0c84e4bb5088cc871abfe2c.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_5c17080efefb459c9bcd5229ae3e4824.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f25627-37fc-4cde-9c98-100e424e5fbb/80301271607.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5316 bytes
SHA-256: 7d8bd607ffcb6b4f8a17315dda8c03f787e8ed79d4d34d00c175800d20e99b6d
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10688 bytes
SHA-256: 62530576a00f07b1e7ff3b50e07e7b754eacc592709c98118821d4642ac4a3cc
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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