Malicious PDF — malware analysis report

Static analysis result for SHA-256 7881de31d9f8e847…

MALICIOUS

PDF

79.9 KB Created: 2021-03-14 03:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02fce65be09b3b79be421b62b887d71d SHA-1: 7a3f3706254b375bda08df54ba9be4c50a1c72fc SHA-256: 7881de31d9f8e847c1021fc6a44b5eb0bc1844cf32cde6582eae24557bd8ed29
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://jumiwimov.ru/wb?keyword=sample%20affidavit%20of%20bona%20fide%20marriage%20letter%20for%20immigration%20pdf, is flagged as unknown reputation and is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/wb?keyword=sample%20affidavit%20of%20bona%20fide%20marriage%20letter%20for%20immigration%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5fcf6b0d80809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_6028852561bdb.pdfIn PDF document text
    • https://jipimolez.weebly.com/uploads/1/3/4/5/134590453/6350936.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/tefegos.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/koxiwetiduvukale.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/how_to_hard_reset_amazon_kindle_fire_7.pdfIn PDF document text
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/vatajevigajeg.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/kopaseviliwumi.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/44566309829.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/20dc3413e12ca27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387813/normal_5fdec93f8e999.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/e2f5c694-04d2-422d-a580-4247c9f4f9b3/dr_seuss_sleep_book_online_free.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_3c1a1b4667984c94b1748f5ac0aee705.pdf?index=trueIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_134a812ae04741a787b6597917507ae1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06556d65-a816-4bcf-a3cd-d3b660f4a949/97848664230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd19f42-5271-4bab-916b-bc71a58b3929/2007_chevy_impala_ss_for_sale.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_80a18752b8bb4e2ab42793c43b6a0278.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_c67aadec39c241738a270847226c03a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76479c11-adc6-4af5-82eb-97b0b622c275/33971767755.pdfIn PDF document text
    • http://lugifer.onlinewebshop.net/bumow.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_b187ddb0fe5d418cb1227e7092cbcfef.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_8687b688cdeb45a0b38972b866c44d27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb20d96-271d-435d-af85-7f0ed3eea672/65211886268.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_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 5488 bytes
SHA-256: f31e57aeb09ad14b92154e019790b6cff05993fef558cd2e9e3b935c3a727ffb
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10692 bytes
SHA-256: 99e740d6e7526b1ac5ff21066630f66d6a76e86cb4ec1c8df0d78bd8fc02dd74

Open this report in the interactive analyzer, or submit your own file for analysis.