Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70cc1d9cb2304f1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-19 03:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 487716482e47e58bb3b79c8aac2b4369 SHA-1: bab62efe42d7370ad94edb90ac8274b09b0fba60 SHA-256: d70cc1d9cb2304f1ac7b9373d7641db3e7cf82e0ec72bfa84ccd3fa8b9d8bc46
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized URLs designed to appear as legitimate search results. The primary URL, 'https://leonvi.ru/award?keyword=calendario+epidemiologico+2020+mexico+pdf', suggests a lure related to epidemiological calendars. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/award?keyword=calendario+epidemiologico+2020+mexico+pdf PDF link annotation
    • https://cdn.sqhk.co/lepavenujal/IidwlAi/58192920898.pdfIn PDF document text
    • https://kaxorude.weebly.com/uploads/1/3/4/0/134095875/mekiwuko.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/4gc6DwO/jikitopidakufe.pdfIn PDF document text
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/depozuzodabi.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/EHZsgih/funny_birthday_gift_ideas_for_girlfriend.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/619637.pdfIn PDF document text
    • http://dukafufuxona.iblogger.org/cambridge_english_for_the_media_student_s_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/R3ggfii/jevus.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/xhbgeha/video_status_maker_app_mod_apk.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/7726098.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://s3.amazonaws.com/gofiguj/sample_essay_writing_for_college_admission.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/solving_logarithmic_equations_worksheet_honors_precalculus.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/35976714416.pdfIn PDF document text
    • http://fetapewifug.epizy.com/ti_81_graphing_calculator.pdfIn PDF document text
    • http://bexudigibop.rf.gd/voxezodowuveva.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/doboradezefawo.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/guidewire_policy_center_10.pdfIn PDF document text
    • http://gijafusatuvaxoj.rf.gd/7610899759.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/nafagamuwalama.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/numazudinujomubujik.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/what_version_of_uconnect_support_carplay.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 5368 bytes
SHA-256: c1a3675af5269a65019d0a1b83894ad2c1c25e04bb36681a5ebbde89d1eae550
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 11000 bytes
SHA-256: 4f2e18e1040049fc27a0460588cba2a277b262cba7080d1ca057a0970a7844a5
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c