Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c912b9c654f33ab…

MALICIOUS

PDF

71.6 KB Created: 2021-03-08 09:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0957dd053251673bc5b183fa1a46c62d SHA-1: a4dfc841099f1a863cdb518d286b0512e4d7f6a0 SHA-256: 5c912b9c654f33abc806927c2d944c9a8ddda503294bee3419dd3d2765ddb573
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The document body, though heavily obfuscated, contains text related to 'Garmin nuvi 40lm gps lifetime map updates', suggesting a lure for users seeking such information. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=garmin+nuvi+40lm+gps+lifetime+map+updates PDF link annotation
    • https://cdn.sqhk.co/lilapanorup/cgggjNa/the_art_of_war_summary.pdfIn PDF document text
    • https://wamebadafexu.weebly.com/uploads/1/3/4/0/134040762/sababin.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/ggogfhv/dodaroxudubuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jighgjg/4042184539.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jRgjgiY/huntington_mobile_banking_app.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/b3c99.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/XMjb1Kb/12_repton_avenue_derby.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/jijhwFw/42475390183.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/jewizopukuni/nuxedefovufebofulukujufol.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/taliwopogojebumopor.pdfIn PDF document text
    • http://rejosunugewojif.epizy.com/73553960414.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/company_business_analysis_report.pdfIn PDF document text
    • http://vujofif.epizy.com/40693362832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d674e5bf-0921-44c1-89f6-242e7a38f5c4/major_barbara_character_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/mizabanafev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d01c448-da41-4c0a-a001-39f58a4dded4/merit_badge_university_2021_texas.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_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 5684 bytes
SHA-256: 9d266791c5b2285a2fb48368681ddbf1f5fff596d3d520fa862f08ecc47ae3cc
font_01_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10532 bytes
SHA-256: 09616fdab1bcf98bb47968f6193082c7503d2b5e2abd0f1e21f3839e4a90a807

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