Malicious PDF — malware analysis report

Static analysis result for SHA-256 668674cb7af30783…

MALICIOUS

PDF

77.2 KB Created: 2021-05-12 10:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 431c60cee090099221691814ed1bb8ef SHA-1: fd67f9e111eba91e8efb69dbab691097be787dbe SHA-256: 668674cb7af30783abf1ee559ac416df8af1e710f9d9c574d93d86bb631f7ac3
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many of which are on disposable hosting. The primary lure appears to be a fake download for a 'Niv bible pdf' which redirects to a URL containing 'strik' and 'utm_term'. While no scripts were extracted, the PDF structure and extensive link farm suggest an attempt to drive traffic to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=niv+bible+pdf+download+free PDF link annotation
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/3c45b4d668629.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/perugasol.pdfIn PDF document text
    • https://juxewuvolexi.weebly.com/uploads/1/3/4/1/134109000/dumelekuvu-zepuwalen-jewonik.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/hdhomerun_prime_6_price.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/nomajog.pdfIn PDF document text
    • https://xibupitosuxusi.weebly.com/uploads/1/3/1/3/131380094/ginixo_nekit_birimezasifiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c5d48c-b109-414e-acea-da9fc9ff47dc/where_is_the_wps_button_on_my_arris_router_nvg443b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412cbfd6-20a8-4307-a7a4-30455a36a60b/amazon_too_big_to_fail_movie.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_888b5a87fceb4d8dbdd788574126c910.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdd3b3d-a354-446e-9589-55d99d3b4f15/97363424528.pdfIn PDF document text
    • http://safodur.epizy.com/who_died_13_reasons_why_drunk_driving.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/40102384608.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/98997228552.pdfIn PDF document text
    • http://javolijokexike.epizy.com/51699580195.pdfIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_d93ce12356b64a69b434397a5a5d915c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/928b2c91-1999-4bce-80dc-aec0ba6ec712/47129126225.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_4eaa725cfeba408d9d7252a0b98f3cc9.pdf?index=trueIn PDF document text
    • http://galexuduxegi.epizy.com/victoria_symptom_validity_test.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/sisqo_thong_song_music.pdfIn PDF document text
    • http://bexilonedatisud.epizy.com/iced_mocha_swirl_latte_dunkin_donuts_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57311ad5-7032-4455-9009-50fd54ccb930/50394699420.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/bilusokag.pdfIn PDF document text
    • http://gipetiwivi.atwebpages.com/antimicrobial_activity_of_ginger_and_garlic.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_da4a2be275ea492fb27fbcb25371c163.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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 5116 bytes
SHA-256: 089e53b29dccb4acc91e91c58c204fbc24fe3448dee479f174d8279023fb8274
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 10672 bytes
SHA-256: 755a32d25f0e71753486d0937dfac52dd1ffa1a09b41bb56952a7c09b29cb05c

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