Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa3a762c22a0b2b…

MALICIOUS

PDF

82.0 KB Created: 2021-03-16 06:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24628d8abe3b44c8b9a415369a4d552d SHA-1: 9e613886a7e479613db4d11f36b13f9225e14552 SHA-256: 1fa3a762c22a0b2b6dbb8dad4ba439299375600c6b216866d7f866e6a9e79cb5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=epdm+roofing+installation+guide
    • https://vanunogagasibe.weebly.com/uploads/1/3/5/9/135964710/9068376.pdf
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/gugijirezusa.pdf
    • https://cdn.sqhk.co/noperizapewo/idyoaPc/should_you_answer_unknown_phone_numbers.pdf
    • http://vuzetasavuxoso.mygamesonline.org/84062660519.pdf
    • https://werobezukivipa.weebly.com/uploads/1/3/4/3/134337965/wutemirimulek_raxozola.pdf
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/zapunu.pdf
    • https://cdn.sqhk.co/sirijunubi/kQJheig/forest_live_wallpaper_api_key.pdf
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/0eedfdb.pdf
    • https://cdn.sqhk.co/pepupiribojo/inuh3yy/96377442337.pdf
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/wuwopulemetogofina.pdf
    • http://luxuwum.mypressonline.com/8403533363.pdf
    • https://cdn.sqhk.co/tifobebe/ggdgeid/parallel_worlds_parallel_lives_youtube.pdf
    • http://luxuwum.mypressonline.com/69944744037.pdf
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/masekutuvusuruwuji.pdf
    • https://bopuwivotapupo.weebly.com/uploads/1/3/4/7/134745193/zilulifef.pdf
    • https://cdn.sqhk.co/savaketiju/fjhjihu/runekodudasudikijisugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_9c2cedd711a441aa93516a245802dec3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e6b2b28-d509-4992-9971-6e20c9a4a423/47227276124.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_4f3023e04570400695c0b95feaf8a0d7.pdf?index=true
    • http://lurolubudoruk.onlinewebshop.net/baby_girl_names_that_start_with_c_or_k.pdf
    • https://uploads.strikinglycdn.com/files/c04f2f4f-d93d-402e-bffe-f958cc1348d3/xevine.pdf
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_f0a9cdc46c8b4081bbe81bb1df46e41a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19cc0335-fe20-46b5-9646-8da0d5c49813/dambisa_moyo_dead_aid_youtube.pdf
    • https://uploads.strikinglycdn.com/files/5395cda6-f332-4a40-a017-c8d22dc9b59c/67280802495.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_5ab6db4e003a4e04994a17f0d06696e1.pdf?index=true
    • http://rodexiguv.onlinewebshop.net/debitupuwomipo.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_81dc2f7c78f24ede8372648bb0a25f08.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a1.bin
75832648caa05f8f511a763b23395dbfc92e852d6c0a0c1ce6d6e0f81e4dc818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5200 bytes
font_01_sfnt_off0001053e.bin
314f4ada8281197299b0eac5b9839a0abb625f3aedfe0effaff9bf62ddbd20cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10852 bytes
font_02_sfnt_off00012a5b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 4324 bytes

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