Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e5e77eb63e97df…

MALICIOUS

PDF

71.4 KB Created: 2021-02-23 21:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff06dc5ee8de7ac36982c1229f815783 SHA-1: f25e42f7670d41c8afd4b263197c2ea361b242b3 SHA-256: 85e5e77eb63e97dfc8fb3641142262d019f3194e4f9e1ab65ad2edf45f10e81e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, suggesting an attempt to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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://druttle.ru/123?utm_term=first+alert+beeps+5+times PDF link annotation
    • http://zobowinizigimef.22web.org/automatic_call_recorder_pro_apk_2018.pdfIn PDF document text
    • https://tidijesugeji.weebly.com/uploads/1/3/4/7/134764535/gosolixaxadobegakidu.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/sakusufimofarutox.pdfIn PDF document text
    • http://blognews.top/88488908458lk9ca.pdfIn PDF document text
    • https://nugazemagutum.weebly.com/uploads/1/3/4/3/134346004/6921105.pdfIn PDF document text
    • http://lnstagram-helping.live/sharpening_a_carving_knife_with_a_steeljc4yl.pdfIn PDF document text
    • http://dezlice.ru/d_d_homebrew_templatespkvmq.pdfIn PDF document text
    • http://makeyourself.xyz/249867750605mq7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotonopeg.epizy.com/23482115610.pdfIn PDF document text
    • http://guxodolabisiruj.epizy.com/67884502379.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/invertebrate_zoology_practical.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/android_studio_create_sqlite_database_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/29464229435.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/rate_of_iodination_of_acetone_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/bluetooth_installer_for_windows_8_free.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/beneteau_first_27._7.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/zikiwovenelofu.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/arrive_guidelines_statement.pdfIn PDF document text
    • http://fosarasopu.rf.gd/bpsc_ae_advertisement.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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 5184 bytes
SHA-256: ea60f7a3ad8883e0fdf82e5d2bcbc1b97b339917b12a36683a7b99e5d16a0f82
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 10400 bytes
SHA-256: 380c26eea7707ed4181e08e7f179bc94757da85835dac9d82cf4c4c724b3e9db

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