Malicious PDF — malware analysis report

Static analysis result for SHA-256 131396ee89e620e5…

MALICIOUS

PDF

67.8 KB Created: 2020-12-06 00:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ba69cf2c87b4d1500df6c3cc2ff76349 SHA-1: 6302362768b1f46dc7dc1a3fb1802d3310188690 SHA-256: 131396ee89e620e51dfb090e48c300f2c74aa1041dbb5a44b9d93b2adbc97b2a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a known malicious redirector, suggesting an attempt to lead the user to a phishing or malware distribution site. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document designed to exploit users.

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://gettraff.ru/strik?utm_term=types+of+e+banking+services In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_5f9a13279bc3c.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/xapabavenonebajukori.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/pazovugal/wn7512bep_wireless_lan_adapter_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/89790665442.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/nova_chasing_pluto_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/berimosaxoromanuxari.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/79530527211.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/beyblade_metal_fusion_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/voice_recorder_splend_apps_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/awadhesh_premi_bhojpuri_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/jopobidoboputuf.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/45899462674.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/14341837984.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/caste_certificate_application_form_rajasthan.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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 5464 bytes
SHA-256: ad8e982f84ed11535f3b1fd0e440e478163f64b49261c15e70b081b496f5c4ec
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10288 bytes
SHA-256: deee1a38d241ed1a4d17559b11415ae55f59b48a1e993c25b7335ca03a06c823

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