Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b6c2e8be95d4dc…

MALICIOUS

PDF

101.0 KB Created: 2021-06-01 23:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a09e4db587c034057099eaab1575fc2 SHA-1: d91fdca0fed6c215012eae9c17dbcf4852467d6a SHA-256: 76b6c2e8be95d4dc1d8e5c91d43993a74e27bbe8416b348a435f0acb4e1f40df
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 pointing to PDF files hosted on Weebly and other platforms, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=android+bypass+proxy+for+local+addresses
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/25dd4901f6cb482.pdf
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/3689870.pdf
    • https://cdn-cms.f-static.net/uploads/4459621/normal_5fd7501e97392.pdf
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/9566216.pdf
    • https://cdn-cms.f-static.net/uploads/4450731/normal_603174cba6872.pdf
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5ffb86cd891d4.pdf
    • https://static.s123-cdn-static.com/uploads/4489850/normal_60076bfe64e73.pdf
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/9472228.pdf
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/lidokakobumatupep.pdf
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/4dd4d10db.pdf
    • https://leladuginaxiwo.weebly.com/uploads/1/3/5/3/135320554/piwuxefid.pdf
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/givegenonabo-vunakurok-muwopagusapunor-nizus.pdf
    • https://pexesalakodosok.weebly.com/uploads/1/3/4/6/134650812/kixevox_lokebekowitowu_wevape_riwutobutetopep.pdf
    • https://x.*.y.com:99
    • http://[::1]:99
    • https://[dead::beef]/foo?bar
    • https://[dead::beef]/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8719db88-31f5-42a2-b78b-1a7bc0226d5f/integrate_cos_x_sin2x.pdf
    • https://uploads.strikinglycdn.com/files/a24de8ca-2fb6-4495-94be-d21a40fa609e/23142193617.pdf
    • http://moxulolo.pbworks.com/w/file/fetch/144453009/how_to_calculate_square_footage_of_a_corrugated_box.pdf
    • https://uploads.strikinglycdn.com/files/1a96a652-e391-483a-8749-378b3595d573/wafibezikalomaj.pdf
    • https://uploads.strikinglycdn.com/files/f9b55d14-5dc0-47fc-833b-9bcd5eb8f1f3/western_digital_tv_live_plus_hd_media_player.pdf
    • http://pugaxigodaka.pbworks.com/f/essentials_of_biological_anthropology_4th_edition_larsen.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144427650/1432047970.pdf
    • https://uploads.strikinglycdn.com/files/8d0d119a-bc23-4282-a76f-4e00b5a3f11b/hitlers_table_talk_quotes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bc1.bin
11e914af382ed91068c389a0f440c7ca9daa28f6cf4effdefc4b5dc8c44a5b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC1 5448 bytes
font_01_sfnt_off00015e61.bin
5a7c96578c9a74503f09ed575aef8f0df05077f48cf6de76b3acd0d6d0cb3b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E61 11744 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.