Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec65c59d740feb14…

MALICIOUS

PDF

159.2 KB Created: 2021-02-24 18:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 33b4aaf900d7dad4612c189949542f2d SHA-1: d5d60a0359492612d2e9a26015255f358a876bd7 SHA-256: ec65c59d740feb143e1fa1b08a0c8f6e9d9a18b3542dbbd2f60d7ed43672feaf
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=python+cheat+sheet+pdf+2020+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385217/normal_6003f287cab1d.pdfIn PDF document text
    • https://karojigulad.weebly.com/uploads/1/3/4/6/134623473/nizoro-razukaredovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fecb05e63d06.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/1Nij8hc/funniest_pictures_to_airdrop.pdfIn PDF document text
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/1432521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fcc5dcb7bf87.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/538824.pdfIn PDF document text
    • https://cdn.sqhk.co/fedijadika/he5Ksjc/tesevutakedon.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/8b0c8.pdfIn PDF document text
    • https://jugujepatuw.weebly.com/uploads/1/3/4/9/134900825/5971570.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/hihaNjj/begalopatew.pdfIn PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/5cb4417285d3fac.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/8pqRC7M/carnival_ring_toss.pdfIn PDF document text
    • https://cheatography.comIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovigebi/64002578008.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/belageddu_yara_mukava_nanu_nodide_lyrics.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/83732246380.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000208c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208C9 2268 bytes
SHA-256: 8e12567a62e1ce48e7b5f080f057592c0103ed9170fd8b0b12d679cc36a232b4
font_01_sfnt_off00021306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21306 5616 bytes
SHA-256: 9ddaa8e3c4259996fbf92f80bb1136ac74bd2ad5a1628ab5ef0ee467c381d70c
font_02_sfnt_off0002264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2264A 15124 bytes
SHA-256: e62899172a6c4f1df9948834eba0f688ca577796b64c8db52ac996a763bef03b
font_03_sfnt_off000256b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256B0 17004 bytes
SHA-256: 59202ae62cc1c40d66478481b4fdc0aaa08e82d860d5b50329a365b2618961a8

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