Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a1680c8723c4c6…

MALICIOUS

PDF

73.1 KB Created: 2021-02-18 14:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2c110636ad1ea1c51548004177e34314 SHA-1: dbda7051b53eefb26a28ea7dfdde2d1db8cc10c1 SHA-256: 54a1680c8723c4c6cfc409a9d3b2507a78dfd74f2a636d13c39809a4967858da
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external URLs disguised as educational resources. The primary URL, 'https://maypoin.ru/123?utm_term=punctuation+worksheets+for+grade+8+with+answers+pdf', and many others point to disposable hosting services, suggesting an attempt to distribute potentially malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://maypoin.ru/123?utm_term=punctuation+worksheets+for+grade+8+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/xiroxozalal/gg7jjCF/my_talking_pet_apk.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/fa68079e6d58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_6006b08acf77c.pdfIn PDF document text
    • https://gizetaxawu.weebly.com/uploads/1/3/1/8/131871526/557668.pdfIn PDF document text
    • http://piredvizhnik.com/lamborghini_chalai_jande_ho_song_video2h6yq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fdecdae3801c.pdfIn PDF document text
    • http://rukozhop-guide.com/get_more_followers_on_instagram_free_appzh92e.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/sozusovoxoni_fegavufaxiv_funusafesusesek_tuted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_5fd27f7d3fd8c.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/ebdb4d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_600fb29066810.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/7dddf46162.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/kizijarepipajosaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_60225f0f60407.pdfIn PDF document text
    • https://suzitarux.weebly.com/uploads/1/3/4/6/134683800/8383756.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/c328f865f7647a8.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/bolafogimemax-mukufi-lukix.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/natusuj-napined.pdfIn PDF document text
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/sujuxarowanubivopi.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/324623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 5616 bytes
SHA-256: c158d6d56b5f879d2e24e01d15388e9adc82a70a0e973150bbf5d8b3af2795c1
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 10416 bytes
SHA-256: 7e9676146d071413770f7275804218feebd1561bc592a77a88947b985ca5a3ce
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2