Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f460929c4191de8…

MALICIOUS

PDF

59.3 KB Created: 2021-01-10 00:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: abaafd620dcb65b7e576bcab52ccd720 SHA-1: eef60a0a67431e4b6e49def7747ea9489a0958ce SHA-256: 1f460929c4191de8e99b74a560e09fa17fb9e7c7ded49ed92c7d052d0341e3b2
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to S3 buckets with PDF files, suggesting a link farm for SEO manipulation. One of the links, 'https://traffine.ru/aws?utm_term=buku+metodologi+pengajaran+agama+islam+pdf', is known to redirect to malicious infrastructure. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous links and the malicious redirector strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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://traffine.ru/aws?utm_term=buku+metodologi+pengajaran+agama+islam+pdf In PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/desorajezu_xoxoliroguzefap_pevopopupesun.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/gadujedubusilib.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/denitoz_jutilukasaba.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/bisapovepizaj/votikekalusalaminula.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/faa_icao_flight_plan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/carl_girlfriends_guide_to_divorce.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/what_is_the_net_worth_of_nintendo.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/android_x86_not_booting_to_gui.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_off0000ac59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC59 5548 bytes
SHA-256: a092107f6be9d6ef43148fd34c5111b3b508d84bb23677334064c7d1da2e6ccb
font_01_sfnt_off0000bf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 9848 bytes
SHA-256: d5b97f1c4f3de02589d185105fa6e19b7299e5be1fb382b735d0abdef8641eba

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