Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad83c74b3d8d97a1…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 20:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91f0edf1facce10f32122de3fd4ba4b9 SHA-1: b73283d67112603c9411ff07f0e300ffb553ff34 SHA-256: ad83c74b3d8d97a1b4b1c29c01cb526be4f6484830c3e77964737da1c2ec3c03
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'jumiwimov.ru' disguised as a 'geologic timeline worksheet middle school'. This heuristic, combined with ML and ClamAV detections, strongly suggests a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=geologic+timeline+worksheet+middle+school
    • https://static.s123-cdn-static.com/uploads/4448103/normal_6005de564a94b.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_60516f22da8cb.pdf
    • https://cdn.sqhk.co/madagijoj/CjfDJme/amazon_cloud_drive_pricing_australia.pdf
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/kiselek.pdf
    • https://cdn.sqhk.co/woleparos/bgeAih2/hill_car_racing_download.pdf
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/rejuz_reneduriv_labezat.pdf
    • https://static.s123-cdn-static.com/uploads/4413696/normal_60095f03be4ff.pdf
    • https://cdn.sqhk.co/lijipatalenu/iegihdv/parking_on_yellow_zig_zag_lines_outside_school.pdf
    • https://cdn-cms.f-static.net/uploads/4491445/normal_6027ef8cd280b.pdf
    • https://cdn.sqhk.co/pabilere/heejgAd/buvijigu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tirisesu.onlinewebshop.net/borofelafijem.pdf
    • https://s3.amazonaws.com/gapivegek/mac_android_studio_adb.pdf
    • https://s3.amazonaws.com/pibabopuduj/laxoz.pdf
    • http://rusabefono.rf.gd/misure_cautelari_processo_amministrativo.pdf
    • https://s3.amazonaws.com/warapagefasovi/neil_gaiman_death_graphic_novel.pdf
    • http://segizeja.rf.gd/dell_gx620_sff_motherboard.pdf
    • https://s3.amazonaws.com/fovezewi/macro_environment_analysis_report.pdf
    • http://kuxixatizoxop.epizy.com/fly_by_night_drum_sheet_music.pdf
    • https://s3.amazonaws.com/najubu/javascript_unexpected_string_concatenation_prefer-_template.pdf
    • http://tofujuwo.onlinewebshop.net/the_social_learning_theory_of_aggression_worksheet_answers.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_off0000e72d.bin
dcb6295fe0d554100b4149890be051d46537163b042415f0e669e85cc171cc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5332 bytes
font_01_sfnt_off0000f93e.bin
3b6b15110d2e46008a343d1e3cded9ee17c9efc87d0a0f63089ce4c91bc9b88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10448 bytes

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