Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fb0c67a3dc5781…

MALICIOUS

PDF

73.5 KB Created: 2020-12-07 03:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a470830ec7e7b4ebf16373fb9f15b0f8 SHA-1: 9c241ac7c9f421f76adb20cdc0fa80d0955d40ed SHA-256: 31fb0c67a3dc5781d7763335fcfbeadbdece0b0218aa58d78a5113b6a0fb6847
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gettraff.ru/123?utm_term=mt+hebron+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8efae8ab018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5f9267b1cb1d5.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/xaxewiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5fcd68884e005.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/gomiv_dapow_wifasagipag_xixerodefupajel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fc1325cf180e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5f9fcabc21ad9.pdfIn PDF document text
    • https://jafumatelitu.weebly.com/uploads/1/3/4/8/134884178/tuditunakinewep_nabanakefebuza_femizeg_figos.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://s3.amazonaws.com/zedilegol/divomavisekifagebizudop.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/dugevediwawapipemir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50966f7cf8c7540456227/t/5fca90fd9bad9c6911aec521/1607110910243/diced_tomatoes_with_green_chilies_salsa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd745bcb0228a2824d01/t/5fc2a7b2145a8629dc079006/1606592435238/41150383579.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 3536 bytes
SHA-256: 14c57008029d810e29c1a9f9fc2d8a2480e55b1478a8ca92a346bbdb189a9cc4
font_01_sfnt_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 4784 bytes
SHA-256: f2cfc33fd4c321925b82a98526eeeda4307c37e5aa451687b77c854e908b8eaa
font_02_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10756 bytes
SHA-256: f1e7888443af97f76c322c960290a279cab0e973b001ab1ba7129aeb796afa1b
font_03_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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