Malicious PDF — malware analysis report

Static analysis result for SHA-256 6977e8dea84dca87…

MALICIOUS

PDF

90.2 KB Created: 2021-03-17 01:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 469951c07f5143524777eb1c4cda8a76 SHA-1: 546ccbdb850967cb785992c045c7c3af3a0090a2 SHA-256: 6977e8dea84dca87d19debdf87287dc2e918d1a3c1f29cfe24965098d97d365a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://yafferge.ru/123?utm_term=biomedical+informatics+director+salary In PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/7901a170e.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/dubotipusuwi.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/ce9b9bf8.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/9260458.pdfIn PDF document text
    • https://dapifakefigev.weebly.com/uploads/1/3/1/6/131636612/pusuveronalolila.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/kubosirivisuzivijati.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/dd8ba001.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/jowutoneranemuk/23351061268.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/wefutexub.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/wafimiliwub.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/double_exposure_action_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/upsc_online_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/simpsons_hit_and_run_speedrun_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/apache_spark_java_programming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/76295390725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c47034-1368-4757-bb8b-467f6c427ec8/telezimuwegije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29423e6f-a1f4-4f5d-a0e6-2c0231646a4c/68226453774.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 9120 bytes
SHA-256: 5599a1bc94f0ab37d8d8a7cdd7fa432011ad9a7c1418e78393fc5387d21ff503
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 5104 bytes
SHA-256: a50336ce60150cb5715ae7ccd6e56422133285569b9857caf8e12af7c2f96586
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 11212 bytes
SHA-256: 9547fce51bb1a8557e2420434a634ad92e2f571aa835078215e7189c89870782
font_03_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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