Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5af1d557866d76…

MALICIOUS

PDF

77.1 KB Created: 2021-05-08 03:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b3393ddd21fbdf55a882f88f6099bb7a SHA-1: 228ead2ac2073847f9418961ca21939583ad92d0 SHA-256: 3c5af1d557866d76cf3757901dcb0e1ae707fe35d287bc56682578b09afeac95
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external URLs points to a likely attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=samsung+refrigerator+rf26hfendsr+ice+buildup PDF link annotation
    • https://cdn.sqhk.co/letijefa/jjjeF5C/42337943742.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/jeNgfby/marktplaats_apple_tv_3.pdfIn PDF document text
    • https://kefapadasogimok.weebly.com/uploads/1/3/4/6/134601884/zipaz.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/pokonoxab.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/hisSmTM/smart_diagnosis_lg_top_load_washer.pdfIn PDF document text
    • https://vogopulopom.weebly.com/uploads/1/3/1/3/131398589/takopoxugizolamalot.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/QjghT4K/bad_boy_cartoon_images_hd.pdfIn PDF document text
    • http://xerujupuje.sportsontheweb.net/resistencia_bacteriana_que_es.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/bratislava_guida_turistica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_da81add7748848e1b9c4c55c8da1b329.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_03146bed2c7a4252ab777656f123879e.pdf?index=trueIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_1ed0d8ae55f04a3584aab08fdaaa1564.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujinit/bodybuilding_training_videos_free_mp4.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_f94c12fbb8d74688809892f973738d11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/dugodotutuzovuv.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_663dd9f5ee1e4fa98ce5eaf3442e9605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/67746958179.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_f16ab1a00fc340f3b0051ab750057544.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_7740a7e3230f44548c21406095048964.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_dd875529954a4849bfc72addd6f38b1f.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_558d2c375e3049f18d4d52ca6771881a.pdf?index=trueIn 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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 6100 bytes
SHA-256: 42c4bb464584f1792d3384e9c729405765329ac02453dba4f2e5e1d427a07a84
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 11240 bytes
SHA-256: 5aab8bd4bee5a14e9642a86c121c0ecd511e75521b01ade33ad3187fb644a023