Malicious PDF — malware analysis report

Static analysis result for SHA-256 862b87990048944b…

MALICIOUS

PDF

70.0 KB Created: 2021-01-11 21:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0576e15843eb57749b1f942f5938e354 SHA-1: 7602e802a7800ecc35b164446a30e82c88c708b8 SHA-256: 862b87990048944b9a4b6793a9522cc1b8652cf383c71b38b10ea8996a791d5a
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.001 Malicious Link

The PDF contains multiple embedded URLs, including one identified as a malicious redirector and another linked to a brand-impersonation phishing lure for Instagram. The heuristic firings strongly indicate credential phishing and the use of redirector infrastructure to obscure the final malicious destination. The document body, though heavily obfuscated, contains metadata consistent with PDF generation tools, suggesting it was programmatically created to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/2982854.pdf.
  • 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/123?utm_term=palm+beach+clerk In PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/2982854.pdfIn PDF document text
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/jiduvi-fobulijir-zidubow.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/icMGAhd/dolureruxogumiwemosixib.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/9709161.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/devenelularem.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/magiluwip-matoranizaboj-pufulitibeti.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/kizuporowefib/zinunalasadowujuziladasi.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/wiwexi.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/72377487044.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/10-_day_weather_report_fresno_california.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/bgp_cisco.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/55612525873.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 5068 bytes
SHA-256: 229fbaec75222978e38f8b07e94f82e379d450578fbd25e0023a6129c4ef00ba
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 11552 bytes
SHA-256: 10d8d97483f2f7d47c3315f6a20c1f5f410ddb0ff9ee776752fbe7dc7e59641a

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