Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec6981ff751d34a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 02:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 977ea1c955c52fbf2c0d3bd3dc1f9f34 SHA-1: 1b81e8ca61c2044e4abc0f29bb2eb4242a49ec0c SHA-256: 7ec6981ff751d34a01e6f770dfd8c28e14e41ab3878f3bdf669dbdec755a60ad
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains metadata related to search terms, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/aws?utm_term=1998+honda+civic+automatic+transmission+rebuild+kit PDF link annotation
    • https://wukugisusip.weebly.com/uploads/1/3/2/6/132695501/tipememoxoko-xugegojuzuso-jalibowixap.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/cartographies_of_struggle_mohanty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_601299cccbaa6.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/8274096.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/delaranosi.pdfIn PDF document text
    • https://rumuxino.weebly.com/uploads/1/3/5/3/135324707/8428601.pdfIn PDF document text
    • http://dovulup.iblogger.org/saab_bahadar_all_songs.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/barnett_4x32_illuminated_crossbow_scope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5fdea53eb6e3a.pdfIn PDF document text
    • http://babumoni.iblogger.org/action_replay_dsi_operations_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5fcd65129831c.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/hp_deskjet_2620_not_printing_properly.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/5139167150.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/how_to_get_sound_on_acer_monitor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigeriwo.rf.gd/antimanuel_d_conomie_bernard_maris.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/7499872231.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/tukivozotega.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/multikart_ecommerce_html_template_free.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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5748 bytes
SHA-256: c342ac2304bcf8bc337a316863f8db9980b0da4941199814d9cd3e1e34491ba9
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10816 bytes
SHA-256: 2a7983ed96136c02b22f39edc3f10a26affd3f089fb60b49ca72b7819b859525

Open this report in the interactive analyzer, or submit your own file for analysis.