Malicious PDF — malware analysis report

Static analysis result for SHA-256 931766adbcfc22c2…

MALICIOUS

PDF

79.3 KB Created: 2021-02-11 04:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7477f20dd0b37bf36fd76289737a8432 SHA-1: 6b9a77e5e0303b19aed4e7b89708b6eb1af2ab16 SHA-256: 931766adbcfc22c2182731dc3d51b4ee3df0775f3b711974d851c834e534a756
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://jottigo.ru/aws?utm_term=hand+drill+guide+attachment, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content.

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://jottigo.ru/aws?utm_term=hand+drill+guide+attachment PDF link annotation
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/5c214c78075787c.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/iahgwie/bovetejivugamolovuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5fcbfa2f465b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5ff4cf140c510.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/TekPigw/video_downloader_for_likee_2020_no_watermark_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/tif21Ib/78080702533.pdfIn PDF document text
    • https://cdn.sqhk.co/jovojatubo/ctIvhe3/58312274764.pdfIn PDF document text
    • http://duboxol.iblogger.org/android_app_development_course_for_beginners_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turufefi.rf.gd/chunking_information_data.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/protostar_joomla_3._0_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/accounting_salary_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/fovopukor.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/world_economic_forum_2018_gender_gap_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/30223753843.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/portal_knights_guide_switch.pdfIn PDF document text
    • http://dijiwag.epizy.com/32732740737.pdfIn PDF document text
    • http://bugelinuxobeva.epizy.com/najasilamule.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_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 5136 bytes
SHA-256: 93d33f4a8848ec35a3e1b1318f33b60ae1c49e08f44b67e080941cc19b8910cf
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10076 bytes
SHA-256: 7bf3f02911e5365be612024e027fea8aa09e63db4f63d9ee66d6568ee779e580

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