Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d54bff851137d4…

MALICIOUS

PDF

87.7 KB Created: 2021-05-15 12:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cd248456e17f69946978d82104ccb4f SHA-1: 6b759ed2864fcca244514b0d7accfbaf2b4fd592 SHA-256: f3d54bff851137d49450b0d676034ee2efd52d4e9f782515132429da2f686b34
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and numerous external links are characteristic of phishing or malware distribution campaigns, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=is+april+a+good+time+to+visit+seattle
    • https://geripefuni.weebly.com/uploads/1/3/2/7/132740274/3e94cd.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://tixugutag.iblogger.org/lorek.pdf
    • https://wibidonegaka.weebly.com/uploads/1/3/4/5/134599285/8cf4b2ab2852cb.pdf
    • http://hopecommunitynaz.com/gegiposumojetadivoxixi1nn9v.pdf
    • https://fuvejewitopi.weebly.com/uploads/1/3/1/0/131070508/logonutid-maleteruv-xipabolugafuz-zumoxipisid.pdf
    • https://gibunuvupu.weebly.com/uploads/1/3/4/7/134746488/5774477.pdf
    • http://menformula.xyz/rinenejevixigilukidaxowos4xtov.pdf
    • http://front-glass.space/23941382165c1um4.pdf
    • http://b4shop.icu/runut4sapb.pdf
    • http://d-youtube.com/big_little_lies_season_2_uk_how_many_episodespwivo.pdf
    • http://midorezif.iblogger.org/check_font_size_in_online.pdf
    • http://yozi.store/wiligabihypyd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_6004de38f32441c292d06b7ae9abe93e.pdf?index=true
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_4634aa8499ca4f8a9584016063ffe74d.pdf?index=true
    • https://30bb9d03-04f1-4043-8ca4-b11f08dd7d37.filesusr.com/ugd/82ab19_d007fd296ba349a980e3e47934b3d281.pdf?index=true
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_b556682c8e1c498f84960fb30bbe7260.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_0fd8f1119bb74c6591cf9eb9230c9669.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_234e88a608e24cefbb3b38c948f71b6c.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_ad74ff84f3c541c0a6584c0ef1f8e65c.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_af10f4109e9b4413934edcf1d7d10ba3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c68.bin
b57d136319046e617a1c2aa2e2b8d6c73eb1aa9ae2aed6f8d81451d8c5ed98b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 4960 bytes
font_01_sfnt_off00011d4b.bin
253963f02dd92ea080850bf3ad95dd4fd0cded90a1e355a78e2166dd1b637acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 11208 bytes
font_02_sfnt_off0001437d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 4324 bytes

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