Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef810d75e2675576…

MALICIOUS

PDF

73.5 KB Created: 2020-12-31 22:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2bebd3435275cdbea19a57ed3aebe711 SHA-1: e20782af2e1a97fa19c167144c4f93a78a41848c SHA-256: ef810d75e2675576b2c8cee3b8f48466afa5a89ad79a038c72a3421ba21238ce
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector and part of a link farm, designed to phish users. The primary malicious URL identified is 'https://traffking.ru/123?utm_term=queen+cleopatra+family+tree', which is used in conjunction with an image lure. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=queen+cleopatra+family+tree In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_5fd0b0304617d.pdfIn PDF document text
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/dujezasuvo_betepadujuzuba_zixepudus_ralunokid.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/fipijife/fagofataxok.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/lugudemadi.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/om_namah_shivaya_chanting_free_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/glittering_generalities_propaganda_ww1.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/a._p._j_abdul_kalam_bani_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/what_heaven_means_to_me_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/burigulirobizamite.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/ignou_admit_card_december_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/aashiqui_2_movie_song_djyoungster.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/seunghyun_lee_asiana_airlines.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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 5148 bytes
SHA-256: 0a9e805787ac383f040ec0652a1c513ed1f1080937984d36d76765523b530ab4
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10320 bytes
SHA-256: feed694125f46ba735f2ca7ce4d14378ee5ba0f1a2eb88766598f6ca0ea7876e

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