Malicious PDF — malware analysis report

Static analysis result for SHA-256 100b0dbc2a554374…

MALICIOUS

PDF

72.2 KB Created: 2021-03-17 00:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e44ab52f7283ea8c517430874def840c SHA-1: 83225774d824266d9b70304c2d9e9332b10aea17 SHA-256: 100b0dbc2a55437452483c7da1920f81bf1edad2622146daa34b826ac8fbcfa0
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 are SEO-optimized and point to other PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=possum+hollow+bore+guide+review
    • https://cdn.sqhk.co/wejafivelij/hcjgnpx/clash_of_titans_2010_full_movie_download.pdf
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/6058619.pdf
    • https://cdn.sqhk.co/libibajuzumu/idtZ6id/breaking_into_wall_street_400.pdf
    • https://cdn.sqhk.co/daladovum/dgdxmoS/ageratum_conyzoides_uses.pdf
    • https://cdn.sqhk.co/minamojazi/Ygp9Lhd/best_board_games_2020_family_uk.pdf
    • https://xonesomo.weebly.com/uploads/1/3/0/7/130739362/fubujawunidavoperi.pdf
    • http://fragcups.com/how_to_install_netgear_wireless_n300_usb_adapter_without_cdk465a.pdf
    • http://businesshelpservice.com/posadujipafefukebazowuk0j7u7.pdf
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/welapaliwet_niwupibov_rusotavolukexeb.pdf
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/wazibogowe.pdf
    • https://cdn.sqhk.co/jadidawa/ighieSf/dragon_ball_symphonic_adventure_2019_usa.pdf
    • https://jisofuzevilane.weebly.com/uploads/1/3/0/9/130969501/wufuj.pdf
    • https://zejebamusij.weebly.com/uploads/1/3/2/3/132302936/munuzuno.pdf
    • https://nuzalegexokoz.weebly.com/uploads/1/3/0/8/130814177/cc082f9ea0919c.pdf
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/devunoku.pdf
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/abff3a2644.pdf
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/78277.pdf
    • https://cdn.sqhk.co/xamitarerivu/bjfqCjh/17467007265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jijumupade/65047154623.pdf
    • https://s3.amazonaws.com/jezobasit/12116607097.pdf
    • https://s3.amazonaws.com/paxunu/basic_vietnamese.pdf
    • https://s3.amazonaws.com/lomogas/austrian_embassy_application_form.pdf
    • https://s3.amazonaws.com/luramamelolem/1217704405.pdf
    • 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_off0000cf2c.bin
3f0ea96700d258ccf587b1bbf8fb57b597a751a3cf0f2ab1f9093fb971c74800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 5016 bytes
font_01_sfnt_off0000e040.bin
851def9fbb0f761bde2dfc4d9c2d3b8b533b186a97269a6e6e2818299a26922e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 10508 bytes
font_02_sfnt_off00010422.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 4324 bytes

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