Malicious PDF — malware analysis report

Static analysis result for SHA-256 42244e4f0905e75d…

MALICIOUS

PDF

80.9 KB Created: 2021-05-24 20:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 51ac9e4cb4b9672cb6d12f510ca6279f SHA-1: 300b6577acedacf2ae5d3b592273caefd7ee261d SHA-256: 42244e4f0905e75d195f2a5b48df0ebe4976c3614830e04496ad36c9cfaa9b38
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like intent. The document body, though heavily obfuscated, contains references to 'warship battle hack android 1', suggesting a lure for potentially malicious software or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • 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://crophysi.ru/strik?utm_term=warship+battle+hack+android+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_5fe63a2d65486.pdfIn PDF document text
    • https://fogovuraperikog.weebly.com/uploads/1/3/4/7/134713912/nobako-saxuw-zutusinag.pdfIn PDF document text
    • https://tasuzifesuxad.weebly.com/uploads/1/3/7/5/137502252/jotimunu.pdfIn PDF document text
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/kovajelawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_60357dd02b869.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/16f208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5fff69c5035b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_60579c6c3f522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_6022a1fcb3a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_6027055d6c822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_606107eef2c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd0dad679fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_6052b240b0e40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ffd2f3b6017a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_605ca8669a99f.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/gunapebefes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fffd9068e498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_600dd39d73700.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/pegek/18202150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43edad18-3a7d-4fbd-8a43-27da0f4e40b8/how_to_train_for_first_ironman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de02d21c-6d0f-4e55-92f9-20367e5ed12e/how_to_turn_off_wd_my_cloud_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3677d6f0-4ca0-41f0-bf6f-51ffedc1da06/15867705833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be9da42-f7b8-4925-824e-560b318b86ab/sanskrit_inter_1st_year_text_book_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d074820d-3ede-4b97-9a37-dc9b65dfe28a/16836378076.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/58715211490.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/call_of_duty_blackout_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/cds_exam_full_information.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_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 5428 bytes
SHA-256: 9ac228010cec8cd0eb5e9d9611d0373a8573e52fd269663400419598d02f4727
font_01_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 12260 bytes
SHA-256: 5197a1db78a46bfd409466ab4d204d0dcf2b4f54d07e527455ad4cdc806232e1

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