Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d28dd5e57f69cf…

MALICIOUS

PDF

75.2 KB Created: 2021-01-28 17:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: e8ba7b402ebc341d324c4ac48d2e1caa SHA-1: 1e03178a58f239e28d69f8eab7c62e1d22fd26ea SHA-256: a1d28dd5e57f69cfd932910e08647315be14a0cd334b1a2a214b4ee195f2e436
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, suggesting a phishing or malware distribution scheme. The primary lure URL, 'https://bologen.ru/wb?keyword=xfinity%20stream%20app%20not%20working%20on%20kindle%20fire', is designed to appear as a search result for a common technical issue, likely to trick users into clicking through to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wb?keyword=xfinity%20stream%20app%20not%20working%20on%20kindle%20fire PDF link annotation
    • https://cdn.sqhk.co/ludibipimilu/jdicWji/arduino_nano_v3_0_pinout.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/jiigjh4/showbag_guide_2019_ekka.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/haeMgdo/9441601205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366961/normal_5fcb4a1b5c24a.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/bepepovoxavipatekiko.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/mXIgigi/40206925445.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/jdRQmKf/movie_quizzes_fun_trivia.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/8369608.pdfIn PDF document text
    • https://teribupugabi.weebly.com/uploads/1/3/4/8/134852699/tiwafemipikofo.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/6635943.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/feliso/1666791197.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/shooting_stars_meme_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/article_of_association_of_a_company.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/aasld_acute_hepatitis_b_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/piano_notes_for_beginners_with_letters.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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 5596 bytes
SHA-256: 69082e4f577c79ee4ad66d5c8e72fb3ec99aa7d19e7624e1947c8f7be4fd4d5b
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10352 bytes
SHA-256: 7df63960fa7bf8010898e79bfe39f477aebed2f1b83a088978e1af364e67fdca

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