Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7b93722a519a45…

MALICIOUS

PDF

94.1 KB Created: 2021-03-08 01:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1742d9a5f2e57ebe96cf92047370c32 SHA-1: b6a18b1f49143057492e56d67ceddd162061e8d3 SHA-256: 8e7b93722a519a45f0dfb85c4ca6e1dd07e7ad939451ad66ea3ef544c39365f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious or spammy content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=zero+belly+smoothies+reviews PDF link annotation
    • https://cdn.sqhk.co/voguzasijur/gxidOgc/galaxy_defense_space_shooter.pdfIn PDF document text
    • https://jotipipadazazo.weebly.com/uploads/1/3/4/3/134319758/jubezubitojibe_genewiwokon.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/Nhagigd/35442875945.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/bifiDpN/loxen.pdfIn PDF document text
    • https://tiwofimobodes.weebly.com/uploads/1/3/4/0/134040820/vizenirodol.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/S0gj2ij/64303511109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxunu/dominos_gluten_free_pizza_menu_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d79bf0-fed2-4526-9fa0-dd64c841e9bc/26016877992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91707bba-ffb5-459a-8bed-e8189e026633/what_is_feedback_loop_in_control_system.pdfIn PDF document text
    • http://tukemujixoku.rf.gd/microsoft_hyper_v_server_2016_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/vutonalasaguwoluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc61154-7730-4f64-9ebc-7620fe08c660/pujubidufesezafafapazi.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/yealink_w52p_cordless_phone_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746406c6-dc7c-4eeb-8716-260f84178984/kodubufanuworilumej.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/39368194994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c36761-34fd-4880-8901-0f213f74f51a/construction_project_management_skills_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bea83c4-28fb-43bb-8127-f06e05f8e2c4/how_to_pair_element_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5082b37-d0f8-46a0-8b2c-67a4a370fe2a/41120209345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f36afbe-f140-48e5-afe5-eb87b09c77bd/how_to_change_jump_force_name.pdfIn PDF document text
    • http://bixogonabu.epizy.com/light_chain_amyloidosis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/43764944404.pdfIn PDF document text
    • http://nasukenapab.epizy.com/12074178868.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_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 5064 bytes
SHA-256: e4d20e7156d25df4c63a9cbd5ae9c6d359b6dbe82fff7660007fea8ca0166f1e
font_01_sfnt_off0001432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432B 11840 bytes
SHA-256: b5fad5c0384b837dc4f16b4ed75c214aafd540b058bb0c40fde8dabd637ba737