Malicious PDF — malware analysis report

Static analysis result for SHA-256 82604640f1b1bff8…

MALICIOUS

PDF

90.9 KB Created: 2021-03-30 05:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ed062b5f5a7da0ebf1543439ab676e4 SHA-1: 2739f682c76dde89582e468d7dd890f1b2e26785 SHA-256: 82604640f1b1bff8582b6b6d1841e75e7f14e6779e79e144aeec3f5d0995f931
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to `jumiwimov.ru`, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=calendario+escolar+2019+pdf+guatemala
    • https://cdn.sqhk.co/xavexapoxiv/gdhgjeF/16251070803.pdf
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/2801e8.pdf
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fcaf12d6864c.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/8444934.pdf
    • https://cdn.sqhk.co/patemugimej/iihcJjf/love_letters_for_him_that_make_him_cry.pdf
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5ff1e02cda8be.pdf
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fe5f3cb62ac8.pdf
    • https://cdn-cms.f-static.net/uploads/4457296/normal_5fe87a138a8c2.pdf
    • https://cdn-cms.f-static.net/uploads/4502246/normal_6032a8cf4a85c.pdf
    • https://cdn.sqhk.co/vuvupewog/gehG73x/24872447173.pdf
    • http://fuwajigub.iblogger.org/economies_of_scale_occur_when_a_firms_long-run_average_total_cost_curve_is.pdf
    • https://cdn.sqhk.co/papovezegep/hQKsoja/free_bible_verse_wallpaper_android.pdf
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/fotadamofuw.pdf
    • https://cdn.sqhk.co/xanovika/jiEhgig/boku_boku_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e6664a59-03e7-4020-8536-59458a8a887c/the_diary_of_an_oxygen_thief_free_download.pdf
    • https://uploads.strikinglycdn.com/files/7faa6d18-28eb-45ca-87f5-2e5333339404/what_is_cognitive_developmental_theory_of_gender.pdf
    • http://tinozireru.epizy.com/captain_kirk_uniform_color.pdf
    • http://mebexadesojixip.rf.gd/weather_report_live_map.pdf
    • http://xikexugisomap.rf.gd/importance_of_variables_in_research.pdf
    • https://uploads.strikinglycdn.com/files/9178dca7-7c2c-48e9-8cd4-70aa0083c091/88622589067.pdf
    • https://uploads.strikinglycdn.com/files/6cab6403-a723-4a6b-9b9f-86b6563f7ccd/zagg_keyboard_ipad_pro_11.pdf
    • https://uploads.strikinglycdn.com/files/5df0f102-e431-4fcd-a7a0-9748ce1f8039/buzakovubovatuniruxet.pdf
    • https://uploads.strikinglycdn.com/files/35ba5934-3a11-487a-84db-fedff6af55e0/dexexenozipezopoxe.pdf
    • http://gopasupefiden.epizy.com/matrox_monarch_hdx_reset.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_off000125b5.bin
52d1ae14d211975867f362eab6a1e01a89610170fdaed4e8d35f1f2322e82e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 5860 bytes
font_01_sfnt_off00013993.bin
8dc29071eaacb1f6e08169f4b6c654a9d22069555b2da662b20a5dc589f19122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 11024 bytes

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