Malicious PDF — malware analysis report

Static analysis result for SHA-256 33903ff3c4a6b14a…

MALICIOUS

PDF

158.5 KB Created: 2021-04-04 20:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c4ad53fb0a070abc338f989f3873c2b SHA-1: dfe577ddc5c4176d48b8d6d55a79ec29b5f926d1 SHA-256: 33903ff3c4a6b14ad1b1843f80efe56f9e45c05cb9586bcae954d776d64a9d44
136 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'slideshow video maker app free' and includes a high-risk heuristic indicating an SEO redirector for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://mezovuduw.ru/123?utm_term=slideshow+video+maker+app+free, which is likely used to deliver a secondary payload or lead the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=slideshow+video+maker+app+free PDF link annotation
    • http://bikokobolo.sportsontheweb.net/nafirel.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/heigfje/fowaxugamedupogobizalo.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/jsifhfB/antihero_skateboards_shop.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/76973297030.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/send_file_as_attachment_in_mail_php.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/bifamomove/pak_navy_jobs_2019_advertisement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa54551-87b4-448c-a497-9c376ccc3751/59524721233.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/aashto_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/modowon.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/81709763318.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/pros_and_cons_of_a_nuclear_power_plant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d482b70-79df-458e-9378-8267de2705f4/atlas_copco_compressors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af9a25b-2580-4a9e-9e30-30e2ba8fb820/are_viking_ovens_self_cleaning.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/raziwomavovijev.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/unscramble_sentences_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/why_was_the_21st_amendment_to_the_us_constitution_necessary_brainly.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/on_becoming_babywise_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd35a48-c2c3-4961-8dc6-726d101fb64a/satonulotibalotupisezif.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFE9 6784 bytes
SHA-256: c16421bb9d5a71f723f020bc61acba34fdc1dcae537d34cdf7ea9a832ca8872e
font_01_sfnt_off00021116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21116 5600 bytes
SHA-256: 2dd68158737fb6281099d509706b4a73bae6a08622f15280615e8a8385c8a150
font_02_sfnt_off000223ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223FF 3392 bytes
SHA-256: 8efbe2eedbd1133115ab8120b66f7c1cf322278368466354bc9356c81262390b
font_03_sfnt_off000231e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231E4 10656 bytes
SHA-256: 85f0cc70fdb75228697bcb56533234468d0a10ae5cb169a661aedcb94dc7f61c
font_04_sfnt_off0002566e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2566E 16116 bytes
SHA-256: 5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e