Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fecfbaf0217a30…

MALICIOUS

PDF

77.9 KB Created: 2020-11-09 19:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b257562ad6b3d4aea19f3151a5feb5d0 SHA-1: ef193aa3792f82460606748fbe19d73005347af4 SHA-256: 53fecfbaf0217a30d1dc0d05bf68d854cb85738b879280e9c1fd5c6185128c5f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs are likely used to distribute further malware or conduct phishing attacks.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?keyword=movie+aladdin+1992+free+online In PDF document text
    • https://foruvojupizife.weebly.com/uploads/1/3/4/3/134352799/fosoka_savakuf_kotineliguwaj_gidimejuru.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/zakikasixavu.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/duritewane_nebidafaxor.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/segetirib_butaregogomej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f933202d5947.pdfIn PDF document text
    • https://putojedenavaxo.weebly.com/uploads/1/3/2/6/132683165/36345a451e5d5c5.pdfIn PDF document text
    • https://zupipozove.weebly.com/uploads/1/3/4/5/134589893/lifenetokiwegativ.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/jazuravazaguz/geekvape_aegis_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/7088517884.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/bimiwoguxajamuga.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/a_sound_of_thunder_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d063ec2-f4bc-4061-88b0-ebc8fdb92232/xaguzomisovovil.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/oregon_country_fair_2017_lineup.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/dakuramoniwixasokokobewi.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/production_clerk_job_description.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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 5128 bytes
SHA-256: 96bc54d7ad37e199be0870dc3b36fec15d4fea7d887ff3cd0f38a87e5d25b14f
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 11136 bytes
SHA-256: 063e4c221aea1e29f7e889041400ceb8ee5c48f833b2c17130ae3f8a96c99c8a

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