Malicious PDF — malware analysis report

Static analysis result for SHA-256 be66e4ec04d779ee…

MALICIOUS

PDF

63.7 KB Created: 2021-02-17 17:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9fbb325f1705ec58fa5b678394d5bcab SHA-1: e7522f07bc29ba78e9d13729872dbbc7d0fcf2c8 SHA-256: be66e4ec04d779eeb4f7586d41e7b8d1ffdc28e57648ffd251ae14cbb72087a9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple external links and the detection by security tools indicate a high likelihood of malicious intent, possibly related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=2006+dodge+stratus+battery+size PDF link annotation
    • http://hookup750.website/the_lost_honor_of_katharina_blumyrxar.pdfIn PDF document text
    • http://bachanalytics.com/aluminium_electron_configuration1yfx3.pdfIn PDF document text
    • https://lomobesozav.weebly.com/uploads/1/3/0/7/130774973/feduxibiro_fipatisinuv_kufeg_bexaretaloxavaz.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/j3Lp3iY/healthy_dessert_recipes_gluten_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/XNhd5iD/zemoxotu.pdfIn PDF document text
    • https://cdn.sqhk.co/texonatuzi/ihQNrjh/1710096440.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/wufusenixiwazedo.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/3235133.pdfIn PDF document text
    • https://cdn.sqhk.co/zumovinej/j6HibwS/learn_to_speak_fluent_english.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/hgjdgiD/90436694383.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/cjfUaih/buzzer_beater_basketball_shots.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/f78gejc/pumib.pdfIn PDF document text
    • https://vawigaxonisas.weebly.com/uploads/1/3/1/4/131438461/gosaxutufudozo.pdfIn PDF document text
    • http://svoytrylend.xyz/zuvegoljepn.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/gjhsKjj/blocky_superhero_moto_bike_sim_mod_apk.pdfIn PDF document text
    • http://ericksandoval.com/what_is_sodium_perchlorate_used_forylv1u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topadut.epizy.com/fupemegoxesinefokabejo.pdfIn PDF document text
    • http://govatojajij.epizy.com/worazuxojajevak.pdfIn PDF document text
    • http://rojugukilajix.epizy.com/writing_ielts_task_2.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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 5588 bytes
SHA-256: 3b28712d6be890fc536ad4b0b0463a99f9ff8a37a5491c019880d54a4725d706
font_01_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 10608 bytes
SHA-256: fee8181796ce428e355cd9be4b6ae90e57c5f52af3d140be2d586b528f60e936