Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b357be96e4d6db…

MALICIOUS

PDF

91.4 KB Created: 2021-04-07 06:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcaa6e034c44bfe36b5760832be31b12 SHA-1: 22dc3cc8ba1f353fd92ab3c9984b6b5296da8267 SHA-256: 79b357be96e4d6dbdb0d45cb565dbee5f06ea431402d5f57597e564795edcecc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, coupled with numerous external URLs, suggests the document is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=gw2+fractal+cm+guide
    • https://cdn.sqhk.co/pulisamog/ii98ggX/92438455099.pdf
    • https://cdn.sqhk.co/lesasafo/hjcghd2/stickman_destruction_free.pdf
    • https://cdn.sqhk.co/wunasesev/hfzgcNH/15324501173.pdf
    • http://waranijovuv.sportsontheweb.net/descriptive_statistics_file.pdf
    • https://cdn-cms.f-static.net/uploads/4393034/normal_6035748a59f27.pdf
    • https://cdn.sqhk.co/ditetona/gfnjact/ikea_dresser_black_friday.pdf
    • https://cdn.sqhk.co/winogolelog/gcjidgg/vivosun_heavy_duty_peel_stick_zipper.pdf
    • https://cdn-cms.f-static.net/uploads/4405459/normal_606804308cf39.pdf
    • https://static.s123-cdn-static.com/uploads/4475875/normal_5fcb25c0949aa.pdf
    • http://bibivire.mygamesonline.org/batuan_sedimen_klastik_dan_non_klastik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nokiva/basolow.pdf
    • https://s3.amazonaws.com/zodawanuror/jokigefekifosus.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_518d83818fa845b9b7a391ed75da3e19.pdf?index=true
    • https://s3.amazonaws.com/gonasidupij/anime_battle_royale_mugen.pdf
    • https://s3.amazonaws.com/nademopor/poulan_14_chainsaw_woodshark.pdf
    • https://s3.amazonaws.com/gewuwasi/flexible_dieting_meal_example.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_b074628fc8114a83a5eba777b38043fc.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f9313cdd364745be96c223a4411c3a25.pdf?index=true
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_9012755590c2439988c1c58e4ef487bb.pdf?index=true
    • http://woxesizefibugel.atwebpages.com/ramadan_calendar_2020_download.pdf
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_72f8d5bc67b74a7c8dcffec8a2475996.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd2.bin
804b11cb08e5fdbcb093a052c07a39972a4f965de648a223d50789edc72e7f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 5084 bytes
font_01_sfnt_off00012d2c.bin
98a06555f2e01a63bca0973ec8f7e7de45982bd070cb965279762254a681b619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 10724 bytes
font_02_sfnt_off000151de.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151DE 4324 bytes

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