Malicious PDF — malware analysis report

Static analysis result for SHA-256 d362c4b79057e8a0…

MALICIOUS

PDF

81.9 KB Created: 2021-03-13 18:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e55010ed0db43010191b8a616607fc5 SHA-1: b5e4ce8c2eff110746b06926b6fc2544515e83dc SHA-256: d362c4b79057e8a038d76c8ef28a128b437b8535fbf3885cc42dd99d4f25a1e3
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 heuristics indicating it is a phishing lure, specifically using a link farm and a redirector to a URL that appears to be part of a scam. The document body, though heavily obfuscated, contains text related to setting up a tent, which is likely a pretext to entice users to click the malicious link. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=how+to+set+up+ozark+trail+3+person+dome+tent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448735/normal_60141f6304ae8.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/sudanaxufuvene.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/41ihDie/21256408457.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/bRlhiPM/foldersync_windows_share.pdfIn PDF document text
    • https://nilezejexi.weebly.com/uploads/1/3/4/7/134737846/kavinuji.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/ijBAlif/best_video_length_for_social_media.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/peavey_classic_50_50_power_amp_for_sale.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/how_much_does_a_cleaner_earn_in_south_africa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5ff00e4609879.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/jcjajgY/pilifupomapuniwadidamivud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/71695cd7-5633-4350-96be-cf105d24dec1/didazofuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/is_msm_good_for_your_eyes.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/lididisebaxamurelimejaxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/bigotry_adjective_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/18936708271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f805ca4-8afd-4886-a12c-80fa67fcd1b6/bibozafo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 3404 bytes
SHA-256: c56275a296b8da15d6181c4045880c4b1870ee1947ba85bbe3abd50da467d475
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 5320 bytes
SHA-256: 16682b7ce7d8dfc367a4596f2741fb93de5d0c96788ee119928b1971f2801a4a
font_02_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10900 bytes
SHA-256: e5ede52a63c96c4ed671f682c65435855d8759fcda3558a96de71d74fb4649e2
font_03_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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