Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf278fefc6adef7…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 14:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 954c2e56a948d6aa0c4ae36773474291 SHA-1: 58384dd5d1780bff1ba2adaffe197faa7b02afca SHA-256: ddf278fefc6adef71f655d81e25aec84256c504067776f4d07a86a3a904b855e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/wix?keyword=marieb+study+guide+the+cardiovascular+system PDF link annotation
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/3938695.pdfIn PDF document text
    • https://rutaluxunenore.weebly.com/uploads/1/3/0/7/130740368/8d86be0.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/2473070.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/891c88e3-5274-4642-8703-86411aa2cb09/58991747737.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/95994321236.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_92cf0c620bee46d1bbd08393c40d6d6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb9c0a3-9690-4c7d-a741-846fb66416b7/17101250750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adc9c1f-d284-4b45-85be-8edc054f5d99/9276958904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da7df02-aa7c-4d75-b9f5-6894dc8974e0/34011768378.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/dufus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a0e262-987e-407f-97a7-e7afd6e44880/78508017209.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/hp_printer_m12a_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddd0d9b-780e-4617-8bfe-c04a930c5cc8/gojebekeboriroke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0458856e-8d1b-477e-a8f1-5e08d221f0a7/black_and_decker_planer_7696_type_1_manual.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_e6385356c5c2497497d839da1bef149b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/2006_bmw_330i_screen_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e0b983-c512-45bc-9eb6-559990b5bee5/super_mario_brothers_ds_game_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26960794-3628-4e02-bcea-a69166d4dde9/gps_tomtom_n14644_prix_neuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3baaebc2-d4a5-4bf5-87e8-9a6db9329043/mcsa_windows_server_2016_study_guide_exam_70-742.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/xokerujilop.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_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 5660 bytes
SHA-256: 6a5686974bfefc84d14e201b16f0b66f30cda0d13241c89d49c2375416a31b11
font_01_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 10920 bytes
SHA-256: 9352965757911c065e5360f5bf5c3b8e58616fca4a4436f12899a4052b9704ff

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