Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c0dcc0b9599223…

MALICIOUS

PDF

83.5 KB Created: 2021-03-08 18:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 62a3522cce9d04cafca912c83222961c SHA-1: 8ea36ac0268a3819ad9209e64f6ae1bb0019557f SHA-256: f7c0dcc0b9599223315981526ab4a262ce328d787cde382f2dc65159dfaeb254
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one pointing to 'xajibur.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=android+studio++instructions PDF link annotation
    • https://cdn.sqhk.co/wozejodes/WihyA3e/fishing_clash_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Y44H8br/65839210707.pdfIn PDF document text
    • http://adv-workshop.site/42207487646ydkij.pdfIn PDF document text
    • http://idealicaitalia.website/18146821495vygom.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/boxujetanonikuv/potolopona.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/vuparo.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_b43d807b867644c094414676646eefac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/gituwaderukanumufutojik.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/hq_trivia_answer_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/inditex_zara_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/vamakorik.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/68953260100.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/wipenureju.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/43785393294.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_ded804d1be45434292fffb519cf29c52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/behaviour_support_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/guided_sleep_meditation_for_peace.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/tavepoviwiwalezeg.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_679868d3fd7140daab2ccf8048fa3b4c.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_25562f16bd0d49499727fd76431b6ec4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/zitagukevunixolik.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_d4a3acb8240c43e68eeed0717cffca7a.pdf?index=trueIn 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_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 4680 bytes
SHA-256: fe9c374d6f369007720597dd4081a1e0e88d4d559a4c9ccfb2fcb2ea01112492
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 11144 bytes
SHA-256: b30da510a9d9e1e72641015035babc6f32c3522e7129d06fe916fee6a6b31274

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