Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a7110b46cba7e5…

MALICIOUS

PDF

76.4 KB Created: 2021-04-06 16:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c8b5938277a2a1210146e9177305fdb7 SHA-1: 21e2314efc03c518efb9f78d55eaf7d249c3b094 SHA-256: 93a7110b46cba7e515935772e579745af2b8b0080b2edf8948fa628564acfb3a
186 Risk Score

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 0.9997

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
  • 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.
  • 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.
  • 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://leonvi.ru/123?utm_term=emergency+call+list+template PDF link annotation
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/telelibikufubirituje.pdfIn PDF document text
    • http://everydays.space/bosch_appliance_installation_manualsthai5.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/acceb4465.pdfIn PDF document text
    • https://lojijuzirikoza.weebly.com/uploads/1/3/4/5/134593465/02d13e3b72.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/sosalipajabukafow.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/zekip-datirekesi.pdfIn PDF document text
    • http://tersq.fun/align_center_button_androidefrlt.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/gimufebemubetemozem.pdfIn PDF document text
    • http://kprovk.xyz/xebavubuvk9gw.pdfIn PDF document text
    • http://milanomoda-italy.website/can_you_mix_wall_paint_with_waterhdzrv.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/53a079a1-707e-4aa0-a2e6-8cf18917b494/drawing_on_the_right_side_of_the_brain.pdfIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_0be33fd3eff64c23a6d846aa4ea80d9c.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_84fc6783c37e4859a9cfd002ff3ee953.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57041314-e1d9-4e27-9885-479e3e89b734/how_to_train_your_dragon_book_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cde0d6-fcb3-43b9-8e2a-651f1e2d6f1e/51036094942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a4c743-f630-45ea-b530-b6ff2c663b8d/air_force_1_custom_designs_womens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cccb1a-95e5-49d2-9f45-0aacc15ab244/59355953393.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_e6d7584ec1e34f6ebd8acc8fa5639759.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_98fdc902832847699ac3b6a645852857.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_171c06094d51457fb6c7f9aded467a5f.pdf?index=trueIn 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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5312 bytes
SHA-256: 8c3db263c74c6bf18727fe01e8b5525235140e4dea43497290e01a672178ab24
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10132 bytes
SHA-256: b2fe111b21a724a26638188652ec85c7a3a9d843b7176185788b264ad14537e5