Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49f87130c3d8160…

MALICIOUS

PDF

68.4 KB Created: 2021-03-22 08:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c228662ca2faa00c94ebd41902094b79 SHA-1: 7b36829dc3e496fe0f2080a484a1cdfe30e726e6 SHA-256: d49f87130c3d816064cde42ac7ccea5ec9871dc8a0bb0ba3bd0be8c2d46dedd2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a significant number of external links, indicating a link farm strategy to direct users to potentially malicious sites. The embedded document body is heavily obfuscated, but the presence of URLs like 'https://bologen.ru/123?utm_term=chale+aana+ringtone++only+music' and 'https://cdn.sqhk.co/jowoluguwoge/9hhrULH/vukakimuwosibov.pdf' suggests a lure or redirection mechanism. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=chale+aana+ringtone++only+music
    • https://cdn.sqhk.co/jowoluguwoge/9hhrULH/vukakimuwosibov.pdf
    • http://gesetaxoxu.sportsontheweb.net/public_health_and_community_nutrition.pdf
    • https://cdn.sqhk.co/lipetebo/oUVjihi/map_among_us_mod_menu_download.pdf
    • https://cdn.sqhk.co/givesaxi/hhi6Thh/32742304020.pdf
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/3c69976d17e9.pdf
    • http://zumewidife.mygamesonline.org/new_perspectives_in_archaeology_binford.pdf
    • http://zodelem.mygamesonline.org/13203473739.pdf
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/vesiwototudovut.pdf
    • http://gojavodevagajuw.mygamesonline.org/buggy_barracuda_plans.pdf
    • https://cdn.sqhk.co/jojojidatun/RhbLA42/nasa_asteroid_warning_september_2020.pdf
    • https://cdn.sqhk.co/zujomawa/jhpyihP/manga_maker_app.pdf
    • https://cdn.sqhk.co/jegivoziba/h28Tyux/amazon_kindle_unlimited_books.pdf
    • https://cdn.sqhk.co/letijefa/ljiqzhb/guzimolavaw.pdf
    • https://cdn.sqhk.co/naboxolat/cOhjqFC/fashion_fantasy_mod_apk_download.pdf
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/tedevus_jubepuvug_zumunib.pdf
    • https://cdn.sqhk.co/jupemuwaze/2rwjeji/53634106510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_958d7475b387469dabca0f15eee2e063.pdf?index=true
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_b6c170b21a1247d1a092778caf308d59.pdf?index=true
    • https://s3.amazonaws.com/fekife/35963441684.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_f874e330cd38478fb9fae69a6d2a0432.pdf?index=true
    • http://likutolejit.onlinewebshop.net/vavikanojar.pdf
    • https://s3.amazonaws.com/purixifusipelid/wasagawetufemineje.pdf
    • https://s3.amazonaws.com/tobobowu/2002_honda_civic_maintenance_required_light_stays_on.pdf
    • https://s3.amazonaws.com/woxotopapozokev/focusrite_saffire_pro_40_driver_mac_high_sierra.pdf
    • 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_off0000cf59.bin
6f03a83b58fd57e42baf0d68e4f62a236ed1a9304dd1b04e8822973f4436b8d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 5220 bytes
font_01_sfnt_off0000e0fb.bin
d1ea43e9cfb003e40f6e10f74fd40fdbe0c32bc0650078e02cd7ef8d6bb4c448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 10324 bytes

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