Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5512edf48bca12a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-18 19:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 205b33ed16fe0c24afe586daf99545de SHA-1: ac13f602f467e3f3cd4d806ababa332b678a9836 SHA-256: f5512edf48bca12a9720563cdac0ec16fde67342725582852a0b60c144d7c152
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting and a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/wix?keyword=le+bleu+est+une+couleur+chaude+pdf
    • http://fosijez.22web.org/kijagutizapatatup.pdf
    • https://cdn.sqhk.co/vovewotutal/tv6gemf/9676070119.pdf
    • https://cdn.sqhk.co/lidupusumoj/cxSWgdO/ap_european_history_crash_course_book.pdf
    • http://sewototenovaro.iblogger.org/online_html_coding_platform.pdf
    • https://cdn.sqhk.co/keropolor/fjemDje/16188161279.pdf
    • http://bidetoluji.getenjoyment.net/nopoxovowevikek.pdf
    • https://cdn.sqhk.co/fikubife/Izyjdjj/89799893807.pdf
    • http://koxudizujan.mywebcommunity.org/basic_electronics_and_communication_engineering_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6030013f17ea8.pdf
    • https://static.s123-cdn-static.com/uploads/4486748/normal_5ffabe56a86e0.pdf
    • http://rabemedexisubis.mygamesonline.org/jekib.pdf
    • http://togibebabe.22web.org/cyclops_spotlight_1400_lumens.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bewomad.rf.gd/10027831131.pdf
    • https://1e89feb0-d301-452a-95a1-5fdc07c83edf.filesusr.com/ugd/607883_0c46fd7621444357892d1b59476f6876.pdf?index=true
    • http://pofazutufugu.epizy.com/cache_cleaner_super.pdf
    • http://giwaseluje.rf.gd/does_ups_ship_tobacco_internationally.pdf
    • http://bifovigavij.myartsonline.com/durable_power_of_attorney_illinois.pdf
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_819f17a76f4b43e29cf45a2b1ea4dafb.pdf?index=true
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_1f70b6fdde39483abaf8cd21fe0b18c7.pdf?index=true
    • http://dojeguxe.rf.gd/bharatanatyam_malayalam_video_songs.pdf
    • https://d2f6477b-62ad-4b86-bde8-abf481119435.filesusr.com/ugd/6f7357_3b2c8ae40bfe4c13ae68624cbd9b1daa.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_5bb0f843bc724ae08e99ca2dee6a021b.pdf?index=true
    • http://zibevili.onlinewebshop.net/3358662857.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_off0000ef98.bin
e695514c598b020da4f72a745a816cf5f19a16b4efdf0cd6bc10e1544b4b125b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5324 bytes
font_01_sfnt_off000101a9.bin
e58e3887204e88067e66d90e8e5d9e4f3c8fdc940f60d2dbd81e63131e302533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 14488 bytes

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