Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7747bb27a591f9…

MALICIOUS

PDF

77.5 KB Created: 2021-03-09 22:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a3b8896a0456af882b9bfa7997ce584 SHA-1: d26e7fbcbe79f722dac60e0b95c64381cf0fc5bf SHA-256: 1f7747bb27a591f9c976f4f2971d4b2b32f5601a41f7252fd26f9616ddb6e582
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious links suggests an attempt to direct users to harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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
  • 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/123?utm_term=best+free+android+voicemail+transcription+app In PDF document text
    • http://ionatr.fun/dozojafevogamalx6zfz.pdfIn PDF document text
    • http://zoneeuro.pro/unlock_guided_access_on_ipadpe3ey.pdfIn PDF document text
    • http://bupro.asia/cloud_security_alliance_certification_verificationw8ou5.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/agheqjh/wifar.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/jdgfhir/41305637855.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/GjeDnib/ruzexibopasek.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/hdhdH8G/5204553564.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/how_to_use_a_colored_pencil2kff9.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/harman_accentra_pellet_stove_insert_cleaning.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/heifPib/ball_brick_breaker_original_game.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/bubedemifuvawibazolifirut.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/0ae4ad4d-0864-43d0-a9b9-f584bef70287/pafilejofow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1814d7f-d80a-448e-a5b5-28a8dbcc54e4/56488769522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5a9843-88cb-4e30-a943-42b4921a7de5/verizon_lg_4g_lte_master_reset.pdfIn PDF document text
    • http://vavazewesepato.epizy.com/how_to_catalina_installer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f501613-44e5-471a-9265-7ac636938c2a/ruzigadujolavemopiwola.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/87052860235.pdfIn PDF document text
    • http://fukibas.epizy.com/fishman_loudbox_artist_used.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/how_to_replace_drain_pump_on_whirlpool_duet_sport_washer.pdfIn PDF document text
    • http://susabumo.atwebpages.com/what_are_the_5_types_of_plot.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_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5412 bytes
SHA-256: d10080d6ea65f64116d64d511e4f7333ce133e25f2586cc9accc7f12cef4538f
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 10696 bytes
SHA-256: 5fa18b835ac6e20370fde86ada73bc92ef01bac1cefefacffe5db8fb7a07ec44

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