Malicious PDF — malware analysis report

Static analysis result for SHA-256 9782bd3086b259bd…

MALICIOUS

PDF

80.7 KB Created: 2021-02-13 08:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 654ab18a6b6b56b28a92b33677e5f47c SHA-1: bee4ea45cb4fb257d8841fe2b71050b838ba2337 SHA-256: 9782bd3086b259bd3a4d88e52cbe0c4ea628cb04f31a670728ebdee0348fb83e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to S3 buckets and other domains, indicative of a link farm or SEO spam operation. 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 external links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/wix?keyword=combined+gas+law+practice+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fe6f5a14e640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_600fd601ea9b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_600453d136441.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/muvavapagewokep-bikawuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446633/normal_60011db834276.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/RELGxpi/golden_goal_sports_park_ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_600f576d9b7c7.pdfIn PDF document text
    • https://najabokaxosol.weebly.com/uploads/1/3/5/3/135300306/mibopowomet-xefoxipubiwem-sejexeviviliwa-radiz.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/9df9731.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/SCRURii/42946677528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fc69235a468e.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/kjjhaPe/50010241759.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/jijagga/luke_bryan_one_margarita_lyrics_meaning.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/lezopobigeza/dirumodavapi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/city_information_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/video_twitter_for_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/quran_bangla_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/80200054696.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/38202598935.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/1079198944.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/21402786558.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/29007162024.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/flight_tracking_app_for_android.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_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 5532 bytes
SHA-256: a3b3c84e953cf76ccd6ea70ffc29ce9629299df9b90110324804d74ab74426b1
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 13968 bytes
SHA-256: d4ef0005220cf3d571d66a3daa0bf036b252e7eb1438c78c83cb92c03d586d68

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