Malicious PDF — malware analysis report

Static analysis result for SHA-256 71041de8a7051f56…

MALICIOUS

PDF

70.0 KB Created: 2020-11-18 15:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 076d05ce9f8224ae3a9c56a5890c3bb8 SHA-1: 0c1e6ef4d9e74f3f09768e60da6a5d5c87f720ac SHA-256: 71041de8a7051f567d17a71ffd7f7ad86c798155938960e4fbb14e4cd650770a
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to benign-looking files but at least one to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

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://trafffe.ru/123?utm_term=regents+june+2020 PDF link annotation
    • https://sawalodisixujig.weebly.com/uploads/1/3/4/4/134490012/51f2a416c870.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/rivemitodu_lemiwusiriw_saluz.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/xotuwuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_5f9a573027a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f91e1dca016d.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/zewulaneroked.pdfIn PDF document text
    • https://bikopevi.weebly.com/uploads/1/3/4/3/134391393/muses.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/rupatojuko/negative_slope_on_a_velocity_time_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78bcec9-d3e0-4c54-944f-32f75575ccab/pewdiepie_legend_of_the_brofist_cheat_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/ne_yo_answering_machine_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/84031743988.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/variable_expressions.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/funding_at_par_definition_apush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c2c4eb-611e-491e-979c-eaeb5af5e59d/filufafunororagovuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/the_white_book_sa.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/30318275211.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/moto_g_cricket_lollipop_downgrade.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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 4872 bytes
SHA-256: 5a3d748ebf449030e5c62279b387c32dd7e9038e41d0e32469fe33ec5dbdfba8
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 10608 bytes
SHA-256: 24c7f429568da0965af7c01e494b023f49159225d5d9ebda3fc303d205611ab6

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