Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c028cd655faaa73…

MALICIOUS

PDF

92.6 KB Created: 2021-03-16 17:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 519fd2aed02fab5d88ae6c9cd85a4345 SHA-1: 4e9c22c06075e1db24a7f49566ef2695b1415fff SHA-256: 9c028cd655faaa7311f9ce3ea7f699d0b2520151c29200a823d806e2ae1ff7e3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=dr+seuss+goes+to+war+pdf In PDF document text
    • https://cdn.sqhk.co/rubupidorinu/PAjfnij/watch_movie_the_freebie_2010_online.pdfIn PDF document text
    • http://unreguezff.rest/27508224382i5brz.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/how_to_get_word_for_free_on_mac_student.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/jjlhPhe/62450032405.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/jikJXjj/diablo_immortal_apk.pdfIn PDF document text
    • http://menbp.online/wedafinuwabasaxejb23a2.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jgvBRv4/artillery_translation_in_spanish.pdfIn PDF document text
    • http://wwbook.org/what_does_a_grant_of_letters_of_administration_look_liked6s59.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/fu68S6o/free_printable_halloween_word_search_puzzles_for_adults.pdfIn PDF document text
    • https://buwolipirawelas.weebly.com/uploads/1/3/0/8/130874522/bowigapule.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/bN5japs/jebozivufipa.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/SIT3wr6/notepad_like_app_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/ageiKLv/tenotobip.pdfIn PDF document text
    • http://fruktovik.com/99433374246isj3s.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/idhhhf6/schema_electrique_voiturette_ezgo.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/hbHicwc/used_dining_room_sets_near_me.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/sefujanev.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/mibiwivanetuj/zenuzurepaniri.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/march_past_band_music.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/68378179849.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/backup_iphone_to_android_contacts.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/chori_chori_chupke_chupke_song_mp4.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_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 5268 bytes
SHA-256: 0e7d67ef498456c783d79bbc5dc9d6825dd73cd8153e0818709ff6b5c03deb74
font_01_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 12276 bytes
SHA-256: c0ea601df895e85974db600d5283035d40b21a0bfe3634b8f56ef31bdbe86cd6