Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ed16b764382d4a…

MALICIOUS

PDF

67.1 KB Created: 2020-12-21 17:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 82e604b06ce78221b6146b47c7e4b9e2 SHA-1: 65c5e8c350d34bad2bd94bb09f858645d2fae7db SHA-256: 42ed16b764382d4ac8d2f27d50c8abc0608b31869f807a1370f79341796f6791
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services and a known malicious redirector. The primary URL, 'https://cctraff.ru/aws?utm_term=reading+an+ambulatory+blood+pressure+report', suggests a phishing or malware distribution attempt disguised as a report. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?utm_term=reading+an+ambulatory+blood+pressure+report In PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/9125915.pdfIn PDF document text
    • https://sidunaxegizu.weebly.com/uploads/1/3/0/7/130776644/c09f34104687.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/6e2271bda2674.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xezuruxovi.pdfIn PDF document text
    • https://jevusesapa.weebly.com/uploads/1/3/4/7/134765100/6de9d02.pdfIn PDF document text
    • https://norajaxufok.weebly.com/uploads/1/3/4/6/134611117/118b5ad99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413707/normal_5fdefc030d958.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/suvemomipap.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/razemupunemim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5f98cf23cb903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5faec2e0a032b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_5fb5d17897fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc6be3860432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6242f968-1460-42ce-9ce7-a7e0bf5aa6e4/jodanuxeninolanidizuse.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc537ce3398ff75154a1c50/t/5fc8ff6502d4045e4d8b05d1/1607008101889/cheetah_running_full_speed_hunting_gazelle.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33b8b3dfdd95b60e431f6/t/5fcbb739da45e86ccaaa4535/1607186234733/switzerland_capital_city_images.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_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 5528 bytes
SHA-256: 68c3a34aa1bf97ae7f1571d2f1f15f7cde8018beb441b5d096275515de6d2418
font_01_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 9784 bytes
SHA-256: 524255d63bf91de02152c16df5a1a4ac0af9a7b984a59196b6bbdabccf760212

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