Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63baed4ea5e78d2…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 05:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a419984900929a34cdbfabb181d3e39f SHA-1: 64ef57191cc372f1bd11139119dc5ebb3ac0f1a6 SHA-256: b63baed4ea5e78d2b54bd45d92b6b6f885d1bf00f0e0c7d505765fcabf285575
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure indicate an attempt to lure users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its links strongly suggests a phishing or scamming attempt.

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/aws?utm_term=is+there+a+gre+fee+waiver In PDF document text
    • http://grandov.pro/action_research_in_english_subjectsh8q7.pdfIn PDF document text
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/mesedukolexojobaleru.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/d11f979b5.pdfIn PDF document text
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/9202943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fd679c26afa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_6010a477bf265.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/2507229.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/patotale/alex_rider_stormbreaker_graphic_novel_download.pdfIn PDF document text
    • http://sivutesafukim.rf.gd/how_to_program_a_craftsman_garage_door_opener.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/avery_templates_for_mac_5422.pdfIn PDF document text
    • http://dosekidonara.epizy.com/lejopojefuberenasotuwo.pdfIn PDF document text
    • http://papivis.epizy.com/jokiziwi.pdfIn PDF document text
    • http://xenemusexo.epizy.com/gupivomok.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/3791583018.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 5088 bytes
SHA-256: 51678a308ea9b877560cc57f29ee52c2298f44683367e5495e4ba4c038651d48
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10796 bytes
SHA-256: 2e9fa95ae1f404f8fc3c6ec3784d9bcbc554cefe27100cc0398902948d0549cd

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