Malicious PDF — malware analysis report

Static analysis result for SHA-256 173b34b03c51e831…

MALICIOUS

PDF

80.2 KB Created: 2020-11-24 07:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 80a39794429eb3504ed40e19e38636c2 SHA-1: 92c33a16965f08442817ba02fef800297e62cd2e SHA-256: 173b34b03c51e8318ca82bc133f4cd94ca1aca029503f6b8f77b29ea2e022eaf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/123?utm_term=sygic+full+apk+cracked+espa%25C3%25B1ol+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f99aaf1c729c.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/witoxewebuboni.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/bilozaxamaveno.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/9152529.pdfIn PDF document text
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/buzuzajamolobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f91dda59ee3b.pdfIn PDF document text
    • https://jibojirugaj.weebly.com/uploads/1/3/4/8/134846900/puvemarijo.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1b9abf-8c80-43b6-a0f1-437c2e32920d/mujisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef50cf62-e850-47bf-9b81-d7728e05e3d4/52270545466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6901e43b-5bfa-4e98-9379-a23010d7d3dc/35441133448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f43804-ad44-48be-9916-7c26dd18eeeb/6086915376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdf9286-e0ec-4232-8d3b-1fada645ac46/tufesidekurasuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e0ec09-75e8-42ce-8b7e-5f48dce817e4/2004_toyota_tundra_sr5_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305d22ce-4e05-494f-806c-e8f113aa0a7f/ar_test_answers_for_animal_farm.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e99d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE99D 11648 bytes
SHA-256: a581bf5cf740c501bc7ac6603216e426dcc8f67fdf354cbc291802feafc202e7
font_00_sfnt_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 6324 bytes
SHA-256: 3733c543eb67a03f3bb8d8a365ba7f295d9fb62bd6825775ac4ff109c922dac9
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 11328 bytes
SHA-256: 62b1ade4dd92d689a11475bb710589af468621413a67415f221b74633f9637c5

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