Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dd9518173ffc36…

MALICIOUS

PDF

65.7 KB Created: 2020-11-17 11:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c5e5681d3687b9f6779cffad302f70ae SHA-1: 825b01c3dc8301e7651986df59d3bd16def2791e SHA-256: b0dd9518173ffc368903bbd7595fc4fb9cef70a0a77d3485c82f3d6e9db0bb4c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/aws?utm_term=adobe+lightroom+cc+apk+old+version PDF link annotation
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/1f23fac6.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5faf6f04299b5.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/juvutotorumi.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/wuguvotajiremasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8bbb867dae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f874e02f1427.pdfIn PDF document text
    • https://welarozukakiwa.weebly.com/uploads/1/3/4/4/134497755/woguwesexejojugofaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_5fae97bb621a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5fad913d3c45a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fa09a74c4f43.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/mupukesunobaga/emoji_font_3_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/conversation_essay_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/animal_kingdom_park_map_2018.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_off0000b566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB566 5528 bytes
SHA-256: 8fba0bc8455016e78fac01ca93705af578a02a963dc016c75d3cd68941fbc355
font_01_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 10412 bytes
SHA-256: c3240768e177a6743d0d8f5c1e84fda98e9c362a53ca70d3e98fecaaf9bea8e9
font_02_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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