Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f28069cbbd76aa…

MALICIOUS

PDF

73.9 KB Created: 2021-03-10 01:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c2ad42abb9286f60e6a1de84b5fe1b9 SHA-1: 9b53cc6347c17297bbe77f115e923d9b3d029ce0 SHA-256: 27f28069cbbd76aa308cae07333e0f770121913a86a2e68bd615fc85f064096c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

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://botokaw.ru/strik?utm_term=steel+arctis+fire+and+blood+reviews PDF link annotation
    • https://cdn.sqhk.co/pobopuwubox/M81Fgib/vobutar.pdfIn PDF document text
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/5809893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_601f6792d5d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_603025255ed4e.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/gjgq6SV/oscilloscope_experiment_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd109579d168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_6026627874f34.pdfIn PDF document text
    • http://trysoda.pro/922838357w8h8k.pdfIn PDF document text
    • https://vetitigozep.weebly.com/uploads/1/3/1/4/131437709/tobidivitufowe_minifuxixiz_teruriwilunevi.pdfIn PDF document text
    • http://sexedate69.site/radio_button_onclicklistener_androidjvi84.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/3f21b7004ae8602.pdfIn PDF document text
    • https://dosodufixelo.weebly.com/uploads/1/3/2/6/132682620/jepuxupiro_xojititifuv.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/ibps_online_form_po.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/xodid-lijitutifujuziv-batiketibetufo.pdfIn PDF document text
    • http://world-wildshop.com/tremor_cordis_meaningwxdyp.pdfIn PDF document text
    • http://moneyindia.site/72675546605b6ptb.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/cJLhggd/real_steel_movie_songs_download.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/ghodi_bargi_chaal_remix_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/wilejugakutezex.pdfIn PDF document text
    • http://likoxupukizagan.rf.gd/what_types_of_intermolecular_forces_are_present_in_ethanol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 1804 bytes
SHA-256: b739811d318f7dc4644d26c60a2a1a37a072f9ca711e88dd272d21e8fe228f01
font_01_sfnt_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 5412 bytes
SHA-256: 085634a2c7cf05cba6b10f25a8701573a85bca4d72b0561b1e455b9f20fdea4b
font_02_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10496 bytes
SHA-256: 4d2ed712bf90dc548043c779c1d62e767f16b856a59f9b97b25b61f9b020422d