Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0bc8cb896b1e71…

MALICIOUS

PDF

80.1 KB Created: 2020-11-10 05:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e607bc48f632ca4ded500e88b73d95d1 SHA-1: 9bb27b5eabc5f25b0691bb011d3db47076c00621 SHA-256: af0bc8cb896b1e715506de7eab9a7cbf05cf225ed82412efb27f6007f673c1c1
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 0.9998

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://gettraff.ru/123?keyword=positive+words+that+starts+with+a+c In PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/2712298.pdfIn PDF document text
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/kegugi_dukebebiwu_riraxasafudito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f875ca846f49.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/tipenoz.pdfIn PDF document text
    • https://zafimalomaw.weebly.com/uploads/1/3/4/4/134458932/pamasexaf.pdfIn PDF document text
    • https://tefufujilidawa.weebly.com/uploads/1/3/4/5/134578337/3fd545bdb8.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/kexamoxusinixu/19457573280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80a6473-2aad-486f-b91a-f1bbab7fbbab/31880152277.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/37225376057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec39e232-c30f-4395-9c70-d193789af196/66630946734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f293626-8213-4f55-a042-595ed6fd6877/wegum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d69fda-76c1-4469-9698-1a4589d543ff/kabagupejarojaxeritudug.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/marvel_future_fight_mod_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/malinconia_ninfa_gentile_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/the_cartel_by_don_winslow_series.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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 4828 bytes
SHA-256: 709663ddddf959a4e80c7fb78f3da7e1bbb6b94733485dc4b0cec01f7f1132ca
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 10092 bytes
SHA-256: 784f6031453e076ee1c21e70f57a0966e87adf0972b97a4dea7bd1dc73209170
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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