Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44fc088fcde141a…

MALICIOUS

PDF

82.7 KB Created: 2021-03-04 11:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d57ac1171fe3eed1f4024a8ec802bb96 SHA-1: ae1700c4d64d5df2c760c1753b368bde5d9349e3 SHA-256: b44fc088fcde141ae39c8e6f94c0e89bc07edbfa07da1e5fae0e6c3fb617b294
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL points to a site that appears to be part of a link farm designed to drive traffic. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious or phishing sites, aligning with spearphishing attachment tactics.

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
  • 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://kuzutuzo.ru/award?keyword=best+powder+for+308+win+accuracy PDF link annotation
    • http://topshops.website/zovisisuwapukunosac4h9.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/piwuronatilik-fetigezadose.pdfIn PDF document text
    • http://vknart.xyz/20344082427o098n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5fc86423ba5f7.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/zesixefe/amish_tripathi_sita.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/at_t_internet_service_outage_report.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/pazebujunuvefo.pdfIn PDF document text
    • http://kidured.epizy.com/johnson_25_hp_outboard_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/betemamesedutu.pdfIn PDF document text
    • http://wujukigow.rf.gd/pavoxegurofotixemitari.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/ziriwaf.pdfIn PDF document text
    • http://sodarag.epizy.com/android_developer_options_background_process_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/75718553055.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/dodaferezalixilorafi.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/87878362563.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/43126558985.pdfIn PDF document text
    • http://jujonejetas.epizy.com/6599947325.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_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 5860 bytes
SHA-256: af36269249478aa7414f9cee616f19cc6056b13ef13cf88402aa200e1eba1b35
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 10184 bytes
SHA-256: 541eb00d0821227c115f5922aea505edc2275cbab2c14d050869974dcd23d943

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