Malicious PDF — malware analysis report

Static analysis result for SHA-256 577cf689b73f971e…

MALICIOUS

PDF

63.4 KB Created: 2020-11-24 09:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11415838e51e8431d458986bca9481ba SHA-1: 77cc2f14ae6aaf837a3c5237a0cf735f4c16d364 SHA-256: 577cf689b73f971eb30a3e7c3fe85482fe29ccb9fbf32ded87a5fb6359d52910
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to contain junk data, suggesting it's designed to evade analysis rather than present legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=city+barbeque+catering+toledo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f89fd166b5c5.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/dususoxepebo-besusa-ruwasuvukedef-jomar.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/lupezimajepid-gopubakonado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f962a48d5b2f.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/magapeguwabe/introduction_to_chinese-_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/somibugipupuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/salary_negotiation_counter_offer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/21914377261.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/detafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c658b86-a5c2-4a57-a6ec-273f791cc1ed/rupumekojexeselezulubuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8744a67e-f92d-43e7-b576-3e1dedfe9aa7/14729655867.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/shark_pro_steam_pocket_mop_vs_bissell_powerfresh.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/technical_report_writing_format.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/fotazag.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/ancient_egyptian_the_nile_river_music.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_off0000bbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC4 5204 bytes
SHA-256: 973b4eaf0f3cb05aca8ecbcc94debb04fd6b644be15b157c899fdcd2b2e793ca
font_01_sfnt_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 10424 bytes
SHA-256: effa04ac2c4cd14a918f7f1b3c87ef7d0713d13cbfe7beeb7735d201ace821f3

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