Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff36739cdb68bd2…

MALICIOUS

PDF

95.6 KB Created: 2021-04-08 17:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fbb9e27d704c377911a8a852b4480045 SHA-1: 7fc2871c80c95481517655f28230b93b08d11bfc SHA-256: 0ff36739cdb68bd2e8d77c744063a012b6e4178f10db4d179c194c8ff3d4bec6
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized redirectors, suggesting a phishing or malware distribution scheme. The presence of a link farm and a redirector to 'dugedepap.ru' indicates an attempt to lure users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=administering+windows+server+2012+lab+manual+pdf PDF link annotation
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/xodaxig.pdfIn PDF document text
    • https://monotolifevi.weebly.com/uploads/1/3/4/6/134683372/kulafig.pdfIn PDF document text
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/birol_zisirixekosotaf_fipejojaxaden_donosodijulu.pdfIn PDF document text
    • https://sekokuvujiziv.weebly.com/uploads/1/3/4/0/134096710/8226399.pdfIn PDF document text
    • http://kemijejanurag.iblogger.org/49525976941.pdfIn PDF document text
    • http://milafikolume.iblogger.org/shelf_life_of_bakery_products.pdfIn PDF document text
    • http://xexejidabame.22web.org/38861140521.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/mexigo.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/fedojigudaj/91483208619.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/72629994953.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_7bb762d281d1435c821bc4d684c6a481.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/dasisozaxuxozatetojate.pdfIn PDF document text
    • http://wigegamumuxan.rf.gd/sunbeam_oskar_user_guide.pdfIn PDF document text
    • http://xaposekesudonod.epizy.com/lean_six_sigma_green_belt_body_of_knowledge.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/shiloh_jolie_pitt_2019_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/bufawelakeder.pdfIn PDF document text
    • http://dukanikurov.rf.gd/66609045709.pdfIn PDF document text
    • https://2fe0a9f4-4d23-48c4-8711-d5fb25093877.filesusr.com/ugd/683a75_e9afc3cfbbf64c16b3c50168a75dc798.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_4f25e813a3d54428828f156326dcee08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/coleman_hot_tub_support.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_4496dff8d40f47ae9740d56a96431db4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/58195554282.pdfIn PDF document text
    • http://raburuterurova.rf.gd/7749924856.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_fce00317f6024a9b8c6620e64d45f89e.pdf?index=trueIn PDF document text
    • http://nalirabagetovop.epizy.com/38723879889.pdfIn PDF document text
    • http://tatovod.epizy.com/human_resource_management_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/cavernous_malformation_brain_gene.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 5968 bytes
SHA-256: d2f36410f65aed3356e92e6a4fb3df10e679233409c24d4331fe541505741d7f
font_01_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 11440 bytes
SHA-256: 84e0aecbb34ea48adc2bc44ace7bceef7e19042bd0bbfabbe42d3e2bc9d37655
font_02_sfnt_off0001589e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501