Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b326fdd830de746…

MALICIOUS

PDF

76.3 KB Created: 2021-05-24 03:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8ae11e2c3fcb64a80685b1fba2187207 SHA-1: 7c3d94d60c969903933c6dac892f63e32289a69f SHA-256: 1b326fdd830de746b4792338caa6c5e86e783e5fece94890bd38a80d7a9f2733
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to a link farm, suggesting an attempt to redirect users to malicious sites. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or scam lure.

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
  • 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://nipisod.ru/strik?utm_term=child+labour+clothing+factories PDF link annotation
    • https://zevixaxilifudex.weebly.com/uploads/1/3/4/1/134131629/dofakovuferezenaduvi.pdfIn PDF document text
    • https://woxejisuwu.weebly.com/uploads/1/3/4/3/134322210/wezokebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_60618ed13ac56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_6066057ac3a89.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/243f77f6-53e4-41d1-9915-12e9b2fdd90a/jikopaxedebekik.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/cdna_and_genomic_library.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4373fdc2-4f5e-4535-a8ab-1ef63525242b/masters_degree_medical_economics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9651fb-91aa-49da-b9bb-35888008f30f/is_it_remake_better_than_the_original.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb46b13-0c8d-4da3-8d1d-9d25e1b313db/romezevogulusuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707ccfc4-718e-4fcd-bd8c-2a9d0f76967e/sosopedepisiliwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de686bbb-41fe-4a2d-a78d-c874e282d9df/20758569434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10906757-67dd-4176-9afa-ae2e35f99f82/wii_rvl_001_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee2d7c2-05e7-44ec-b213-bfec7dc2bda1/macbeth_script_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d97f74-f15e-4527-99fb-699e3f99bc0d/princess_and_the_pea_movie_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b25570-c72a-445f-9411-15dcb8efb34b/value_of_gamma_in_otto_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/27341014016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b575c4-6a07-4bac-b1b4-69413887fd76/4476597173.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/camrose_morning_news_police_report.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_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 5328 bytes
SHA-256: 813fcaf6a74cd77d03a41be78e4ddd783ee61cf0f8631abeec226e73df8c1077
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 11260 bytes
SHA-256: 1b12135c1fd912ee32dffeb348283a9e16700f57a5e853616bfa8fba1a1c3b81

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