Malicious PDF — malware analysis report

Static analysis result for SHA-256 331ddc7591d25d9f…

MALICIOUS

PDF

86.5 KB Created: 2021-04-03 02:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8976128ccd731dc827274ddbc0d0a74f SHA-1: d6fb7efcf73264a930b9abded6fb441965e654b6 SHA-256: 331ddc7591d25d9f585d746010096bb540908a7c8e5a65d782ea76c62815e899
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=emerson+nature+transcendentalism+quotes PDF link annotation
    • http://kovamuwaropepu.getenjoyment.net/omni_mae_paint_mix_ratio.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/navulifuwufix-ridum.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/7374608.pdfIn PDF document text
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/dapenowu_rorelosujet.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/lujavuziwiwe.pdfIn PDF document text
    • http://kipededevidabun.iblogger.org/biochemical_analysis_of_medicinal_plants.pdfIn PDF document text
    • https://nopefoxanav.weebly.com/uploads/1/3/2/6/132696012/2fde57e93dd2d2b.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/3ff0810.pdfIn PDF document text
    • https://jivefumo.weebly.com/uploads/1/3/0/7/130776755/fumilara_molinokexavakop_fumezubera.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/8721761.pdfIn PDF document text
    • https://cdn.sqhk.co/makekajet/CCBMJgc/wutuzaluwisud.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/hizjfja/vefakixev.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/GjdeRha/printable_photo_collage_templates_free_download.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/bitsat_sample_paper_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/8giy3ha/dozupo.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/ibQLuUc/v-_live_houston_right_now.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/32621624441.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/7366993.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/jajowujevavusekokupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eaf7ec7-a857-49f6-b2e0-de658ad38e7e/kuxebonabujolivewepoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe045cc9-a48b-4861-8dc2-4ab3265acde4/gavozivasajunupiti.pdfIn PDF document text
    • http://fotafufoka.epizy.com/45169744847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30712ec-f833-487b-80ff-3d10f761e09e/what_are_the_different_types_of_nonfiction_genres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3321dfc9-62db-495b-b959-ee2efcea9998/tijinukinuzibep.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 5168 bytes
SHA-256: a15f78be6ef8b5948505adaf078d632d51d50cc2a41ef225e402e1e3b9b7cd00
font_01_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 11000 bytes
SHA-256: ee645f2b55ac68e8abe030a7414c248a0755147f316fc39ac8e6f8694bbc03d3