Malicious PDF — malware analysis report

Static analysis result for SHA-256 d356ae1fc5d74eab…

MALICIOUS

PDF

84.5 KB Created: 2021-03-22 10:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63bf3d021104c6e42760fb98ac0c31b SHA-1: 35bae70bb599ac35f3062377383728dc67ed8bea SHA-256: d356ae1fc5d74eab5a701e71500826a0a7907f2bffd6fb644eda8384ba1b58fc
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 in phishing or spam campaigns to redirect users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+qualities+does+a+good+team+player+have
    • https://cdn-cms.f-static.net/uploads/4419415/normal_600d70842e420.pdf
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/95971778a2414b8.pdf
    • http://voirly.xyz/36865692079kjjtq.pdf
    • http://filanion.online/bulitel333j.pdf
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/7709e3a7875c3eb.pdf
    • https://cdn-cms.f-static.net/uploads/4411702/normal_5fd9f44f83432.pdf
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/kopakupogokowa.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_60524007a96ed.pdf
    • https://cdn-cms.f-static.net/uploads/4403820/normal_6051f20d9c7f2.pdf
    • https://xikixunajaxata.weebly.com/uploads/1/3/5/9/135959014/luvopuwonufow.pdf
    • https://cdn-cms.f-static.net/uploads/4501037/normal_6044d873c2219.pdf
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/5348531.pdf
    • http://myfavoritesun.xyz/being_peace_summarynotsw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d99f8001-0607-4423-acdc-d65da3cfa134/33947547456.pdf
    • https://uploads.strikinglycdn.com/files/600bf31e-1764-47ee-b412-072a2f558c9c/unity_software_stock_ipo.pdf
    • https://uploads.strikinglycdn.com/files/3f812f21-59cf-4b8d-b023-2877b103301d/45777723741.pdf
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_6333f8f16b1f410b89fde43f3846fd03.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5a66d3c-7e4c-45fb-a117-7a7e6e21e117/les_trois_mousquetaires_film_1961_streaming.pdf
    • https://s3.amazonaws.com/memobofilenabon/nujosugufojiralajuviwakad.pdf
    • https://uploads.strikinglycdn.com/files/6acc336c-d122-47e2-8b20-5c4d049bd83f/junorewex.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_30e25bfed33e4ef7b465e0d2571d3bcb.pdf?index=true
    • https://s3.amazonaws.com/tolivajupeku/free_android_phone_data_recovery.pdf
    • https://s3.amazonaws.com/gelawiweza/korisosajurug.pdf
    • https://s3.amazonaws.com/gotenukevepunin/2031462990.pdf
    • 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_off0000fe4b.bin
81dd485177e0bee44b3b83ae163d5c8e94a4c3079e33b4806655985840f8b0ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 5452 bytes
font_01_sfnt_off000110e8.bin
3f3291e466a7ac708e27544e264bdd09fe792c8b02f80f016141af6451fd1144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10808 bytes
font_02_sfnt_off000135c5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 4324 bytes

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