Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c876c369e3c91c…

MALICIOUS

PDF

85.8 KB Created: 2021-05-16 07:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a2e6034d4f7978b757c17dd43694437d SHA-1: 27c62b671a5888705276ecc8ef5806481ef1c9fe SHA-256: 79c876c369e3c91c000ab585d87f19362f0ad7aa08dca424abd3b1c94dd2b0df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, contains a URL that appears to be a lure for users interested in Minecraft, likely to redirect them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+spawn+the+wither+storm+in+minecraft+xbox+one PDF link annotation
    • https://monirazosakazux.weebly.com/uploads/1/3/5/3/135316997/892675.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/9547142.pdfIn PDF document text
    • https://fagojature.weebly.com/uploads/1/3/3/9/133987822/guvisewuxi-rezuvop-jasujijibenog-tadamegobineje.pdfIn PDF document text
    • https://fafogefefotal.weebly.com/uploads/1/3/5/3/135314601/lakobasofonube.pdfIn PDF document text
    • https://lezezirurebox.weebly.com/uploads/1/3/5/9/135967023/499840.pdfIn PDF document text
    • http://sutonazijusi.iblogger.org/anatomia_fisiologia_del_higado.pdfIn PDF document text
    • http://fumumowovufa.mywebcommunity.org/pifezodukamorajefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fesizufutubejug.epizy.com/the_economist_9_june_2020.pdfIn PDF document text
    • http://ranedugipepin.epizy.com/buwumolorududa.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/convert_ppt_to_jpg_small.pdfIn PDF document text
    • http://xaxelajifamukas.rf.gd/roll_banner_mockup_free.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/rimamolug.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_9258a1ea87264967ac7655499babe2c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/33429738985.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/resident_evil_biohazard_ps4_trophy_guide.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/15516863411.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_8e26414c855c4c8190abef442dc0c986.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/berlin_sleep_questionnaire.pdfIn PDF document text
    • http://jasosuwer.epizy.com/73268004873.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_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 5484 bytes
SHA-256: 369f31ce73a84b88eca7168e2fdaba71dc9d13dbdb538950574e4405e27a74a7
font_01_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 11624 bytes
SHA-256: ea87da6662d67f24fdf96fc252811ab8a942f63cbd6d5433db76369d5cbe9a3c

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