Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f559133499afe6…

MALICIOUS

PDF

81.1 KB Created: 2021-03-18 13:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a3b48214a703d20d5035713f4e8b72e6 SHA-1: a22da33f67f8ed5ab23178240dbd6d86f368a17b SHA-256: 22f559133499afe6fb7fcf20a1964895c22658e5d08ea8d406cff10756cace75
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. One prominent URL, https://jottigo.ru/strik?utm_term=what+are+the+deals+at+taco+bell+right+now, is presented in a way that suggests it's a search result, likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/strik?utm_term=what+are+the+deals+at+taco+bell+right+now PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/palevijuj/bukab.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_4ed400a7a12b4ff08fb3107a07de988b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/788924e2-3495-4947-bf0b-744956ada677/54345193426.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_a0dfa997aee44105851eb5ac0455c8d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/copper_chloride_sds_sheet.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_431a4b3257c14288b16eba2453d67a86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c97f653-5d83-4766-a68c-52887f03d38b/how_much_are_dues_for_delta_sigma_theta.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_7eab31061d0d4f5d9e4cfa723766ce17.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_f42aa048f15c4e90b52af3f8344308af.pdf?index=trueIn PDF document text
    • http://nozozuwovore.atwebpages.com/82771036259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd765a6-bbae-4230-abca-4ecbeb79b477/craftsman_table_saw_motor_upgrade.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/leferekepumulelefej.pdfIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_f577e7ee79584efab713274270ed60c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/facebook_videos_private_url.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/causes_of_abnormal_behaviour_psychology.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/10577667489.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_f6667d81e589431798f384e80002df52.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_0dc5517d7fc84a99bb1e2126d5fc0385.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/46830136424.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/26352333419.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_4e416913f4ca42a5a1fef75563515f1f.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_9623a280360f43b3aa5bae9a7158b6ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8675d864-d913-4384-a9bb-aa11856350d1/why_is_my_whirlpool_washer_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/50157969344.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/who_makes_the_mercruiser_4.3_engine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 5236 bytes
SHA-256: 3f273331afeae7d93e780aafd7fe2466f04edf1ed58ae1ba3ce6224cbb3581f5
font_01_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 11408 bytes
SHA-256: 61395e5a0a6ff4aaf1d8ccaa8ac04a6bce75721ce3d1dc7dac5e68bf89a5990f
font_02_sfnt_off000128ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378