Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df7fd4a8d7ecf1d…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 12:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c212afe605772ebd56c6faf2fc0bbb4 SHA-1: 690421cb8fa87b64d959b53be7066c8325ac7d31 SHA-256: 6df7fd4a8d7ecf1d18936003607dd6b608573c0e9309c80f6cc66c128b22a60a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to a redirector URL (https://jottigo.ru/strik?utm_term=rock+cycle+bill+nye+worksheet). This suggests a link farm or phishing attempt disguised as a worksheet. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=rock+cycle+bill+nye+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450249/normal_602bde8667a62.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/7449c4192b98.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/8791627.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/ee88a0.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/8617367.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/fijatawititakedetuvufamin.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/myers_points_out_that_our_social_behavior_is_shaped_by.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5fe6647d4cb96.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/31933385792.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/angle_bisector_problems.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/xewamejixolefaj/download_film_fifty_shades_of_darker_2017_subtitle_indonesia_lk21.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/printable_brain_training_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/amigurumi_treasures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/gamuminojepabujujevisoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/68396168855.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/toxeliripelatugen.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/garmin_gpsmap_60csx_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/30117805722.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/how_to_clean_filter_on_dyson_v6_motorhead.pdfIn PDF document text
    • http://zutaturusix.myartsonline.com/34327720974.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/parvana_full_book.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5080 bytes
SHA-256: f7fb980259855a21517b81e95560806ad7a0b220f310c24ec5871bcae2e32c5f
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 11492 bytes
SHA-256: 0cc68ccf084d93aca2e66c1f3f1c0f168e7aeb5154faf1dae5cd136d5c9bfec5

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