Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f937b7d94e089bc…

MALICIOUS

PDF

79.1 KB Created: 2021-02-21 22:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bc5c024fc315f90d77ed3865ba777c19 SHA-1: 3622629baf1423b6f1cee7943a18abacc3a49fb3 SHA-256: 3f937b7d94e089bce78bedd2b4341806d5db4fee5732902b23bd6d731124ddc1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicative of a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest malicious intent. The document body, though partially corrupted, contains text related to a 'holy rosary prayer booklet', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=holy+rosary+prayer+booklet PDF link annotation
    • https://cdn.sqhk.co/vefusujix/zy28shh/cd_queen_greatest_hits_1_e_2.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/eevgcvz/kojajemanujobobuxupelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367300/normal_5fcea76f80382.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/9460079.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/5757972.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/bidRphh/manhattan_neighborhood_nyt_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/iidPijC/49087411768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5ff770bbdff27.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/fgihfjd/amazon_advertising_success_stories.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_6032af165b414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5ffd72ed90e2e.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/dhg5TRL/snake_attack_3d_simulator_anaconda.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/jajdugd/75068668288.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/penale/wagipuzewumeka.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/vodafone_mobile_wifi_r216_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/mitugabafetolobomofexipe.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/fiitjee_aits_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/calculus_textbook.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_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 5080 bytes
SHA-256: c0ad75385fb5052d770fa2735de0a786416fb1907495645abe8c6552cc856086
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 10316 bytes
SHA-256: edcb4abfe06c46a9fd709b04d3d68d4f9a42279fcbf9b3bce234e02b2c5afacf

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