Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a3b2210db7fb56…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 06:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51a76659252318504fbb5e2b58628c49 SHA-1: d1984d9d2e8fe1ee75d00305ecafb8121b76e527 SHA-256: e8a3b2210db7fb56b729ae4386d8356e38e9b92058983db037336ea6e3febc08
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6664

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/strik?utm_term=how+much+to+service+a+vw+amarok
    • https://vodemiteju.weebly.com/uploads/1/3/4/7/134722100/2270df5f39.pdf
    • http://sewukagazub.mypressonline.com/harry_potter_book_covers_front_and_back_printable.pdf
    • https://cdn.sqhk.co/lojadisexudo/hhjbpoz/bloom_s_taxonomy_verbs_chart.pdf
    • https://cdn-cms.f-static.net/uploads/4416304/normal_6022fa3070de8.pdf
    • https://xuwirebusupedun.weebly.com/uploads/1/3/4/3/134379604/199342.pdf
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5fe2df92dd431.pdf
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5fca3c1b0d8cf.pdf
    • http://dewisazovuvoxi.mywebcommunity.org/lenguaje_corporal_femenino_atraccion.pdf
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/zavoxebukema.pdf
    • http://tebapewulodafe.getenjoyment.net/dolls_house_emporium_wallpaper.pdf
    • https://cdn.sqhk.co/geroterunetu/eEjdhdn/17073827104.pdf
    • https://cdn.sqhk.co/luwibajik/dihqpje/37130831106.pdf
    • https://static.s123-cdn-static.com/uploads/4463552/normal_5ff6690429d9f.pdf
    • http://joriwolujuf.sportsontheweb.net/muxaxa.pdf
    • https://cdn.sqhk.co/vipujitebiki/gI4vjgh/zovadaxudimazemoza.pdf
    • http://vetebozo.mypressonline.com/3639472730.pdf
    • https://cdn.sqhk.co/devisofage/9CnxEHi/the_weather_channel_live_apple_tv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_618dfaa3a6af4f5bb4c9c04b3f1d0071.pdf?index=true
    • https://b57d2ba2-989e-4187-ab2f-e88ff5a458ca.filesusr.com/ugd/70c1f8_7715fa01e9e7440c8a7d68e4afc4251c.pdf?index=true
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_9bfe9431c33946c194a995f007a2e6a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47f3451f-90a8-4b70-9998-5d50168be1f6/how_to_change_time_on_casio_illuminator_wr100m.pdf
    • https://uploads.strikinglycdn.com/files/8318c966-e52a-40ef-94e6-45f59a0c5fd2/7093784418.pdf
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_f4fe86dbb242497f8dc0be04ebb48174.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96795416-a15b-4749-aa1b-4872ec537fc9/banupave.pdf
    • https://uploads.strikinglycdn.com/files/2268a475-9053-47e9-bee8-333158ea84a0/cyber_security_salary_in_canada_per_month.pdf
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_03014674394e4183b204c50f376c46d3.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c3.bin
433acc7229d4240b5f89d2d9be38bcd66bc7fe919101e13be0c794b708585b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 4960 bytes
font_01_sfnt_off000107b7.bin
b4ca4cdad1f4003b26a5280023b837097a2e6fd8b2d2068af74eecd4dda98d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 11276 bytes

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