Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae453641b5d51779…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 04:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c4d6dd45455cd354f427f6c514c409 SHA-1: 96ff21afa173fdecd2367f8ac35034848809b2ad SHA-256: ae453641b5d51779e75ad615a7f79a5dda9d9e0b4862031949eddf2f6b2388b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, flagged by heuristics as a link farm and identified as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, contains metadata suggesting it's a disguised resource. The presence of external URIs indicates an attempt to redirect the user to attacker-controlled infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=castle+rock+state+park+map+pdf
    • https://cdn.sqhk.co/zolilobup/iggfihe/kutikif.pdf
    • http://kalavar.xyz/laxizemobafinomerf8ddk.pdf
    • https://static.s123-cdn-static.com/uploads/4457857/normal_5fcc56ddbcb3e.pdf
    • https://cdn.sqhk.co/mofekuma/ZzggqPl/nomulujen.pdf
    • https://cdn.sqhk.co/madobeborozu/jgfij8M/guide_to_among_us_tasks.pdf
    • http://jomawogopepapaw.22web.org/thinkorswim_fees_reddit.pdf
    • http://affilateapp.online/tulejoxzo3.pdf
    • https://cdn-cms.f-static.net/uploads/4475586/normal_5fdb2f85c276b.pdf
    • https://cdn-cms.f-static.net/uploads/4475375/normal_600fdc4a12ee8.pdf
    • http://sesizuxewewax.mygamesonline.org/vestal_watches_costa_mesa.pdf
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5fcc0d761a858.pdf
    • http://vebuwovivulab.mygamesonline.org/vastu_shastra_download.pdf
    • http://bbflowers.net/vasokofemarozaturobaxiguxyemj.pdf
    • http://goligofalu.medianewsonline.com/apc_back_ups_cs_350_manual.pdf
    • http://samokex.sportsontheweb.net/bupujud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/28ee9c48-4220-4b7b-b02a-7582c0b8302c/46857286170.pdf
    • https://uploads.strikinglycdn.com/files/87fafb99-e9ad-4bd0-907d-578ce6473157/one_punch_man_season_2_english_dub_netflix.pdf
    • https://uploads.strikinglycdn.com/files/3b2ee363-9cd2-4834-864f-b8d93e5184fc/tavawogi.pdf
    • http://zunimesigo.rf.gd/business_letter_format_sample_with_letterhead.pdf
    • https://uploads.strikinglycdn.com/files/c3c86c71-9dc9-434d-a4e2-495c5bc9f4cd/wapudonevenit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f665.bin
9bf81661c1fb287a6cf05d4d224327c6f116e4db4cc9d8addf5876140b2181d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 5024 bytes
font_01_sfnt_off00010784.bin
c712e6a6806aef854b2ea448c779a4d489fdbf50d80bf454fea1cebe904ff3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 11616 bytes
font_02_sfnt_off00012f3f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 4324 bytes

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