Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d0491a3f8869a3…

MALICIOUS

PDF

82.9 KB Created: 2021-02-21 02:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 36d8d134dfaf42a604c7eb1e1e0ee4c2 SHA-1: 335119cf241b592fe4fcb70df4d43821b74fb8ef SHA-256: 86d0491a3f8869a3a76826f98fe4fdebc83fd9b19f6641a89deab69e680464c0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and appears to contain keywords related to 'Tolima colombia elevation' and 'wkhtmltopdf', likely as a lure to attract search engine traffic. No scripts were extracted, but the PDF structure itself facilitates the redirection to numerous external URLs.

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
  • 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://druttle.ru/wix?keyword=tolima+colombia+elevation PDF link annotation
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/9547724.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/rutojani.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/9c1012ab3518.pdfIn PDF document text
    • https://koniwosusuzese.weebly.com/uploads/1/3/1/8/131856176/kurovewelusa-gipofelub.pdfIn PDF document text
    • https://cdn.sqhk.co/derilunadine/WiaO1jf/71571839715.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/151e4.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/9381792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5ff4c071ccdf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474170/normal_5ff23e7348088.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/8399080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/bts_answer_love_myself_music_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/what_is_the_capacity_of_my_kenmore_80_series_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/jenazowigubeveb.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/68585340926.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/sivowiwilevafetotutobi.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_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 4820 bytes
SHA-256: 418ebb9b003d6ceeab0b169d38be733a509a075514396102c01ae15be1190d0d
font_01_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 14928 bytes
SHA-256: b7e604e0a69dc19dff523f8fd39e2e0949bb09459e70e7b2b79bc1b9ca79fbf4

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