Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1e94aef54c19c4…

MALICIOUS

PDF

68.2 KB Created: 2020-12-22 11:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 98e836779e8593fee02757d4d373e819 SHA-1: 70bbc667717ee21549844c265d18b1d77cae7918 SHA-256: af1e94aef54c19c4a0ba4a2548dd0205fb20f2d90887ed42f3252be28b27f368
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic for a link farm suggest the document's primary purpose is to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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://traffmen.ru/strik?utm_term=usa+simulator+2+unlimited+money In PDF document text
    • https://fumifopimon.weebly.com/uploads/1/3/4/4/134464078/vutinipinuxi.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/lazarekinep_xukujilup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5b49f8-761c-4774-8273-0ed536dabf91/62059357356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0016881-e10e-4eba-8e20-bb4e57981383/frances_gramatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396b6657-218a-4d69-a457-8d32f5830b9e/kejesavafukezotuwewej.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/west_bend_cookware_store.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dfc5405d5340f3296f29/t/5fcda9293ff10115400e64a9/1607313705677/w3schools_css_templates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed4f1452f90b7fe57e24/t/5fc13993a97599144e240559/1606498715703/92314341141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052a5986-8c67-4d24-88b8-ca40a5edd40c/74503002231.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/sizeg.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/umpqua_river_fishing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35187903-85aa-4e71-b853-4380b6439fbe/90338232420.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc652bba3bf4b14abce1555/t/5fc6a84f08845d0924769ac2/1606854735247/undeniable_word_meaning_in_malayalam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 5196 bytes
SHA-256: 7c7cc9c28e14f1937d58a52491ec5f370eb3a587e40296006909d3ed109c935c
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10644 bytes
SHA-256: 89660d54e03af703166cfb763a1c98254d26e40d4492c09a660914761eba5098

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