Malicious PDF — malware analysis report

Static analysis result for SHA-256 af79eaba1c60ad58…

MALICIOUS

PDF

66.5 KB Created: 2020-11-22 17:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6bd158500273f44c749347123ff84e1d SHA-1: 8107a3706768b0cf5234c56cefa03b471e8a7181 SHA-256: af79eaba1c60ad58479d625cc06fa36de5895bdb218af79ce90cfe7b87bec640
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The document body, though heavily obfuscated, contains references to 'guitar hero android apk data', suggesting a lure for potentially unwanted software or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=guitar+hero+android+apk+data In PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/118d882e318410c.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/dibekuwur-dukulega.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/xelib.pdfIn PDF document text
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/xodatusab.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/e9004b3ab9bd7f.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/119e09faa5f8b.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/kurufe_devomikata.pdfIn PDF document text
    • https://mewopufi.weebly.com/uploads/1/3/4/2/134265659/xujedu.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/sufinipu.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/nitirew/biditan.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/81540483041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e3c421-f0a0-496d-89f2-2907bb916e74/97434331862.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/82979832527.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/honeywell_rth6450d1009_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b5708f-615a-4569-99fc-efe67df1f3bc/buwamof.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_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 4932 bytes
SHA-256: ca4b3068cf17e299bd5d5f23a6c1c0c92690393c52e4cabda3888dc9b3cf677f
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 11280 bytes
SHA-256: 77bb3c20e728ff9fcb996ab84af8b53b0ff03fcc82811f6a8764e7e903ba4bd2

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