Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c32f8d650997c8…

MALICIOUS

PDF

83.7 KB Created: 2021-04-04 10:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 719f63fc4f4c50194accef6b2667f01c SHA-1: 2ff8baf2b9bcb2c040369f1e011a010186d59255 SHA-256: a1c32f8d650997c8fc0740456bb4dc185009a784eac5f835bfd0c118f7ee3036
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one that appears to be part of a link farm designed for SEO manipulation, and another that is a direct link to a PDF file hosted on a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to a 'medical leave note from doctor'. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=medical+leave+note+from+doctor
    • https://cdn.sqhk.co/ruwonumatag/t4jaihn/kerala_blasters_stadium_crowd.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://cdn.sqhk.co/xubewarow/eeij3jg/61785286320.pdf
    • https://cdn.sqhk.co/julukijowi/cFyjchZ/core_java_mcqs_with_answers.pdf
    • https://cdn.sqhk.co/nafolekuge/ogfOWij/ahlamalik_williams_e_madonna.pdf
    • http://luzupogakij.sportsontheweb.net/aligning_with_your_higher_self.pdf
    • https://cdn.sqhk.co/puxedimuwo/kgigija/vujopiwozixezoniregosavux.pdf
    • http://55571.ru/farm_animal_colouring_pictures_to_printqalxp.pdf
    • https://cdn.sqhk.co/xefijumu/jehcheB/pezukowi.pdf
    • https://cdn.sqhk.co/bisuligiga/b78jegc/light_and_airy_presets_for_lightroom.pdf
    • https://cdn.sqhk.co/tobamozusaj/fOhamBa/world_war_2_games_hacked_unblocked.pdf
    • http://pokypka.xyz/apc_smart_ups_x_1500_battery_replacementdnxel.pdf
    • https://cdn.sqhk.co/javeduner/jajcKGc/amperemeter_camper_accu.pdf
    • https://cdn.sqhk.co/wibezudak/2ihgeja/u_mobile_centre_shah_alam_seksyen_7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rodigapigeta/a_panda_eats_shoots_and_leaves_examples.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_1323988d6e2d43dc9fa355cced02cf61.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/finnegans_wake_lyrics_irish_rovers.pdf
    • https://s3.amazonaws.com/jupoti/17181163987.pdf
    • http://jekurur.atwebpages.com/beautiful_boy_book_download.pdf
    • https://s3.amazonaws.com/jasadavebaga/57852486567.pdf
    • https://s3.amazonaws.com/tutasujal/23799744936.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_687c4bc772484abcb6c63b0f1c35ce3c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ed.bin
0d9cae2e3b9dbf0492e2aff6522c92172a2137bcc54e421206a75f24811a5356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 5056 bytes
font_01_sfnt_off00011a1e.bin
15a4717cb360a2d62caafbfd65af60289ea92a595f409af9afbf89ec84fd34a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 11024 bytes

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