Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa73e19ef6992cea…

MALICIOUS

PDF

94.6 KB Created: 2020-12-02 10:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 92196d866f7e76e2c41c3fde5c039d5c SHA-1: 145ff898ceaa09feb7d1ecc49b504922e10dde20 SHA-256: fa73e19ef6992cead520be7f9856b4f660500214dcaab386a1086ccb76b440bb
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector and a link farm. The document body, though heavily obfuscated, appears to be a lure related to search queries, aiming to trick users into clicking on these malicious links. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cctraff.ru/123?utm_term=ap+biology+chapter+9+reading+guide+answers In PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/0e212cbcf0db1e.pdfIn PDF document text
    • https://lafapimiwegu.weebly.com/uploads/1/3/4/0/134041150/1bb7452d3d1720b.pdfIn PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/9169713.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/vikukinumet/zemojixes.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/98313255534.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/blue_jay_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/87803972859.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/crossbill_guides_spanish_pyrenees.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/dreamweaver_8_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/51510682218.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/latawele.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/liftmaster_elite_series_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbdc3d7-2ffa-4179-9bf3-bdbac0204d4b/juwuvulozibepavi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 3028 bytes
SHA-256: a8bb295adce06666852798224f8c17cf63d4c16f7697ae4b42c723da0a07d689
font_01_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 5812 bytes
SHA-256: 3e278b71fccd296944eaef1dd4fa452033a1c84b07e552fbcef14d6fe41e9500
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 11348 bytes
SHA-256: 000dab5b5a0a32fb77ae35fa71609f2baeedceaba61b023d62190148f80680fc
font_03_sfnt_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 16392 bytes
SHA-256: c5762a321b3a6de6c056a88862f32451f227bbe063aa54530cee2af78068e3d6
font_04_sfnt_off00015cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCE 6068 bytes
SHA-256: 4b45f33c909d1de4119f908b2e4eeec8b51571bcf8b126b8fe9c8b95bec6d9c2

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