Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb7044eab6c4732…

MALICIOUS

PDF

72.8 KB Created: 2021-01-11 23:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 68d0cae3868da13fcef4f7939512076e SHA-1: 7a417fd85c58089face20a80bb2a0fe1756fd105 SHA-256: 3bb7044eab6c4732f55f8ea0c97b572b7bc432cc609d8e21089abc9781f80080
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to invitations, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://trafffe.ru/aws?utm_term=70th+birthday+invitation+templates+free+printable PDF link annotation
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/xurazudotujag.pdfIn PDF document text
    • https://site-1168202.mozfiles.com/files/1168202/sitazatolezejakukotojurem.pdfIn PDF document text
    • https://site-1176636.mozfiles.com/files/1176636/xuvibe.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/8815474.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/dalapifola.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/4965520.pdfIn PDF document text
    • https://winofugunolef.weebly.com/uploads/1/3/4/8/134846497/39225.pdfIn PDF document text
    • https://site-1174558.mozfiles.com/files/1174558/xirubazajevofem.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/52209685354.pdfIn PDF document text
    • https://site-1179337.mozfiles.com/files/1179337/naval_games_for_pc_free_download.pdfIn PDF document text
    • https://jozifopavix.weebly.com/uploads/1/3/4/3/134355896/ponelanubukabiw-busage-wubejarafos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/mirajabofemetelevuketerot.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/10451624311.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/68349503664.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 5496 bytes
SHA-256: 5784f7f4687bd3a45da3c4fdfb3e99c6204032d2d2e60a31a1e4f001b0526f7a
font_01_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10608 bytes
SHA-256: f55ccdbfccf9414049bfccb681e03baabc05502cee8498ea4865e1180cfecba3
font_02_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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