Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d9b109e6cf090c…

MALICIOUS

PDF

86.2 KB Created: 2021-03-10 03:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ab469e16b287ba1658adb9ac1a00831b SHA-1: 1115c1861ac9de33c955181069660710823112f1 SHA-256: 28d9b109e6cf090ce64c1b30e23a23b8749449ae7682e3b55f7891c136789840
144 Risk Score

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 an image to redirect users to an external URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://maypoin.ru/123?utm_term=dotted+writing+font, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=dotted+writing+font PDF link annotation
    • http://bodaweziwov.mypressonline.com/what_is_special_service_usps.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/72429415387hj1gp.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/IpibVhe/like_a_boss_movie_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/gjmiajF/zokifo.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/9567386.pdfIn PDF document text
    • https://mamotuzukaw.weebly.com/uploads/1/3/4/4/134438076/c78cc7285daca0f.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/SoPvSig/viwada.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/4739916.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/wNjfyGU/bad_banks_season_1_episode_3.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/company_of_heroes_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/MLgfAjj/92948848332.pdfIn PDF document text
    • https://kajabukege.weebly.com/uploads/1/3/1/3/131379037/komen.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/how_gm_diet_plan.pdfIn PDF document text
    • http://healthit.space/ninawofovifuzdl5yj.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/pogek_vadidop.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/dbf80a3c-47bd-4254-b852-ca8c768b8d57/pigiremutemadabajorul.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/asus_rog_strix_z390-_e_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/android_tv_box_pubg_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/gogutorodupademenuxofog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4bee24-dcbb-48e7-b884-5ddb96cfc227/14920978017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bf7465-d384-4da0-b202-fd342e131f7d/46441277425.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/0-12_months_baby_development_milestones.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/drawing_with_pencil_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/best_android_games_2018.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_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 4744 bytes
SHA-256: a857a9f22bb7c09b4695ae2fe97e509d0351777b7de4f6dafd1a13c1456df629
font_01_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 10880 bytes
SHA-256: 2158c74020e17e764b94a1e4c081a1113c3899174059cef8c948f117557a2f02