Malicious PDF — malware analysis report

Static analysis result for SHA-256 042ed83e1ade9c4d…

MALICIOUS

PDF

79.9 KB Created: 2021-05-12 10:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b21a45d8399ee08ac00029d467faeb SHA-1: e8e65f832267b462d5ae77b27ee6b1f6f5b89297 SHA-256: 042ed83e1ade9c4d5dd08069454353aeff99d979f0bca80fec6ce7ed9974766c
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, appears to be a user manual, suggesting a lure to disguise malicious intent. The presence of multiple PDF links and a critical heuristic firing for malicious redirector links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=9300-ena+user+manual
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/9827493.pdf
    • https://cdn.sqhk.co/vadetegubufo/hjbzJhh/sas_visual_analytics_dashboard_examples.pdf
    • http://verenica.net/bizarawuzibevumueoe2y.pdf
    • https://cdn.sqhk.co/lawafopugu/FI8ZBjc/harris_jackson_interior_design.pdf
    • https://cdn.sqhk.co/daxutoxod/RILyFZR/20821695272.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/2971442.pdf
    • http://qwertyujg.xyz/6147732309410axv.pdf
    • http://mazanatur.space/5689280546co0lm.pdf
    • http://garantiya62.ru/ejercicio_92_algebra_de_baldor_resueltob7owv.pdf
    • https://cdn.sqhk.co/mufipofunup/geihmid/ultimate_photo_mixer_for_pc.pdf
    • https://kitipodowenin.weebly.com/uploads/1/3/5/3/135383326/7998275.pdf
    • https://gozowejikagigu.weebly.com/uploads/1/3/5/3/135345496/tutakug-nasopa-tanoko.pdf
    • https://cdn.sqhk.co/xumobopore/EAx6giw/33316121893.pdf
    • http://comforfemj.fun/spotify_target_audiencei3mgb.pdf
    • http://fastpysystem.online/koginasues3z.pdf
    • https://cdn.sqhk.co/kususarefeja/ieic2jc/70508584956.pdf
    • https://cdn.sqhk.co/dofubetu/gfjcsgf/bugsnax_trophy_guide.pdf
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/likenaruwuwuxik.pdf
    • http://vilopeg.xyz/83599712913svsub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_2e523e2bcf72466ab0131e4c671b018c.pdf?index=true
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_e23a964552d94c8688adedb30c4417ad.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_a685c8f655da40ae9f9aace2a9776589.pdf?index=true
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_60cda280f2f9485489fcb507d9381693.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_23774f99a43b49328fa06d13b72ee565.pdf?index=true
    • 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_off0000fafd.bin
4e4c420f6ba7bc667571f61a00d4fe8403128dfb32059be6c14d755bf5b063d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 5232 bytes
font_01_sfnt_off00010cae.bin
2926f47bb8aa6077162332bf4e3a8eda7d968b2b54dafab7a00cc760de1abb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 11032 bytes

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