Malicious PDF — malware analysis report

Static analysis result for SHA-256 81753b28abc96f69…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 20:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 085510dea0480e998603dddd6c90f905 SHA-1: d05f5d1fb69dabcc1e7e4a2a2289891a6a2b0ad9 SHA-256: 81753b28abc96f693f1b74178998777da1f2bec05feb9ebb28d3d6bed63b5be3
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers with high confidence. It contains a large number of external links, indicating a potential link farm or a method to distribute further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=tie+blood+knot+fly+fishing PDF link annotation
    • http://maxidaxuwifu.22web.org/is_android_the_future.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_600778d62e041.pdfIn PDF document text
    • http://bexibuvisez.iblogger.org/sirufitezex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367667/normal_600889be0ecc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_6024aa51624ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ffa968017d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_604fee21ac48d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_601cb480ebdac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60217b83a3354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_6030ec6058dae.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/jolunenafobuw/lubezemawoxabes.pdfIn PDF document text
    • http://sobosewo.rf.gd/chapter_4_time_value_of_money_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/88558092816.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/gixilevezutoradi.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/john_deere_lawn_tractor_oil_change_kit.pdfIn PDF document text
    • http://dagasadat.epizy.com/93293917894.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_e9ce6866a4124b25ab1a9a3826d23a8d.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_dfe158644f7946a4952577bc4d3c5155.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_43ec176385f743029b57a6664fde7410.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/choose_your_own_adventure_books_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/lg_g_pad_8.0_wont_turn_on_or_charge.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/3410009215.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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 5116 bytes
SHA-256: 95721455f8a76d47832b71551a8005046c16d146bcaf94facd6f1f44caf3c25f
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 11096 bytes
SHA-256: f284d0daac881a0d3e746fe1461330ac406e28e9a2a566a80de779cbf88e9a61

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