Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc397b3cd3b112c…

MALICIOUS

PDF

82.0 KB Created: 2021-04-03 04:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04285f5ae9787e536a11c3cf6113968c SHA-1: c24ff55edd180a2468a7a725b88b051efad24987 SHA-256: 9fc397b3cd3b112c3ca227678c474cce04864e026e2792df111e537ad2c0c96b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a URL related to 'emulator android untuk pc yang ringan' indicates a lure to attract users. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://dafemum.ru/123?utm_term=emulator+android+untuk+pc+yang+ringan
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/bixogoliz.pdf
    • https://cdn-cms.f-static.net/uploads/4461497/normal_60212ab8e58e6.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/gixewe-senilufiziv-pukesipunux-desajaxivaxuv.pdf
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/3683841.pdf
    • https://cdn-cms.f-static.net/uploads/4464080/normal_600ab73d5c4c8.pdf
    • https://gewolurigidanax.weebly.com/uploads/1/3/1/3/131383018/kajuwuxinorok.pdf
    • https://cdn-cms.f-static.net/uploads/4494431/normal_6033eb7e3026c.pdf
    • https://cdn-cms.f-static.net/uploads/4454550/normal_604175e4483aa.pdf
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fcbf1d20d5cd.pdf
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5fe423697fa1e.pdf
    • https://fiwarurebel.weebly.com/uploads/1/3/2/8/132814972/bad03568.pdf
    • https://ginamorevuj.weebly.com/uploads/1/3/4/3/134392530/bevimi-dajiwazesal-komutoxep.pdf
    • https://lobepujijas.weebly.com/uploads/1/3/5/9/135966441/3892549.pdf
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/xazedalojeme.pdf
    • https://zagajewogumemos.weebly.com/uploads/1/3/4/6/134627596/lavodaka_rukuvuxovi.pdf
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/lobazeguguk-bimozir-gukega-zojuxipatej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0acb623d-eb89-423f-a34c-5a52541cfac9/cuanto_es_un_metro_cubico_de_agua.pdf
    • https://s3.amazonaws.com/tumasun/tasefuluvusoj.pdf
    • https://s3.amazonaws.com/ninasivol/how_to_get_a_cpt_code_added.pdf
    • https://uploads.strikinglycdn.com/files/fa6798cd-99ed-4737-a3e6-d28bdb833b2e/it_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/4d597ca0-339f-4e49-8e13-35d3c8fadcc9/reality_transurfing_download.pdf
    • https://uploads.strikinglycdn.com/files/e5e8c383-d8bb-4007-986e-e0f37a861a29/futufuzudadi.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_off00010420.bin
4360ead409bab31814a55c06192b2bbfc1c1eae01c6447287fc8bf88aa4e5847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 5340 bytes
font_01_sfnt_off00011643.bin
4ca7c8f98a892f24add1c6e942e5d4182fa0d9c93275540aec6281aef52d8c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 10520 bytes

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