Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff731d7995dd05e1…

MALICIOUS

PDF

83.6 KB Created: 2021-01-04 04:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e4b3ac4511d1944467c5a9bfcc6d4e33 SHA-1: d158193eec32f0a71de4ca7467cabeaa40a9300d SHA-256: ff731d7995dd05e1d8e59cf75af8bfc18906884bbbead8e905451361ed4729fb
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous embedded URLs, including a suspicious one pointing to 'gettraff.ru', suggests the document's primary purpose is to lure users to external, potentially malicious, content.

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
  • 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://gettraff.ru/123?utm_term=buen+trabajo+in+english In PDF document text
    • https://tipuzinugex.weebly.com/uploads/1/3/2/6/132682040/logugebedekivozud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5fe23700ae939.pdfIn PDF document text
    • https://vukuwapebu.weebly.com/uploads/1/3/5/3/135310377/lipipipesijopebofeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd6155344ebf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea79efe0-be86-402a-b572-81d4c296cff4/93293448045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bff4a4-17f1-4c32-beae-c08595c49684/balancing_chemical_equations_worksheet_10-_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/vedururidiru.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/andrologia_guide_for_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/58501393474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13e952d-3551-4c0f-8c71-7252640f1ccc/7219675364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8decaee2-4dfe-4fd6-a0ce-d023ad612804/swingline_stapler_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10f3d30-d43b-406f-aa5e-5203aa4e6e32/lesone.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/disifuxaraterexokuso.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/geometry_transformations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/uefa_benchmarking_report_2011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b90c694-7acb-4c61-89b5-831e66442547/diruwinipebimijezekapaj.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001136f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1136F 26556 bytes
SHA-256: eb0e7cbda2fccd5af49198d49961457690de24ea555252ff5ccc4e278b0d7aee
font_00_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 5212 bytes
SHA-256: 548235b359738ec109c1a04399ecfb45e20c560b97a980b64e9a6a6d25a5359d
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 11524 bytes
SHA-256: 2a0d66991fabfd2363cab295f441f0cc4cc4d85d32e1791f8a9780d3c5116ec8

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