Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca10a843589e96e…

MALICIOUS

PDF

115.8 KB Created: 2021-03-15 01:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b18af31170d33840919c087c91ee7669 SHA-1: df881947302f8d33532c1545d8ec5f6049eace6b SHA-256: cca10a843589e96e0bffb2d35934786ef9ab3af5dabaffb4a9d3597730991df4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/award?keyword=metabolisme+basal+pdf
    • https://cdn.sqhk.co/waxolulum/ghhihbB/murder_hornet_size_vs_bee.pdf
    • http://tertov.xyz/mikusovelebelusato2evjg.pdf
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/7727465.pdf
    • http://fresh-ita.space/why_is_my_hp_3830_not_printing_in_colorvpju8.pdf
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/1139743.pdf
    • https://pefizisiguxuv.weebly.com/uploads/1/3/1/4/131438819/jufowekugivib.pdf
    • http://cadenalia.com/mallampalli_weather_reportmw8rb.pdf
    • https://cdn.sqhk.co/wamiratena/JAhePif/chiari_malformation_surgery_adults.pdf
    • http://madamzero.com/what_happened_between_the_old_testament_and_the_new_testament8ghv4.pdf
    • http://webmastervlad.ru/wimezubuvefafenisuparetobtk8fq.pdf
    • https://vinedenakebuz.weebly.com/uploads/1/3/6/0/136020142/4268359.pdf
    • https://rovoduwomu.weebly.com/uploads/1/3/5/3/135332400/32491fc519a.pdf
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/luxezarebiju_sodomif_rameja.pdf
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/konud.pdf
    • https://cdn.sqhk.co/zezegawutogu/xjjWJXr/rca_universal_remote_control_codes_for_sanyo_tv.pdf
    • https://cdn.sqhk.co/goberirud/GbyGxgi/venom_vs_spiderman_funko_pop_release_date.pdf
    • https://cdn.sqhk.co/nezerozara/hjiDJjg/dalaran_status_report_wow_classic.pdf
    • http://axecheat5.xyz/how_to_put_an_equilateral_triangle_in_a_circlegvzsa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_59f0dcb1f13c4e80aeae2ef210f836b1.pdf?index=true
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_86af53634174445ba315813acef9eb8e.pdf?index=true
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_f8dfec7e3b404a1a8f8a208aebe1ffb3.pdf?index=true
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_4b7d939a7b604235af390c5706a78c77.pdf?index=true
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_241eee4ce57941cfa3c076d848f2ec4f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171a4.bin
3c3936fb3f1b9f3180796b6dfbd1dab457bb5546612a15d03c085f3d636a0aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171A4 5236 bytes
font_01_sfnt_off0001836a.bin
10c725bfe4b38021d9692c9389eff1507bbcb729a924338808a8b8766f87173c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1836A 12292 bytes
font_02_sfnt_off0001acd1.bin
397fe5414dec2c15ce2f473ad0342ce0840b72755ea6be921150e09650397fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACD1 16108 bytes

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