Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8021a60b85cb12…

MALICIOUS

PDF

76.6 KB Created: 2021-03-06 05:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b67188a392707ddf1d825209b4d8d2ae SHA-1: ddba4472c8525fde0b07a7655069cb23b4603160 SHA-256: 4d8021a60b85cb12a87ff7e0eeef2c5ac77107999e493da235f779a50d814506
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, possibly for further exploitation or credential harvesting.

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://bologen.ru/wix?keyword=jane+eyre+romanticismo PDF link annotation
    • https://cdn.sqhk.co/xubenijevewe/igS0id6/bubble_letters_lowercase_m.pdfIn PDF document text
    • http://ulekschool.online/zalilurafazuvufurebenovjm.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hh0CgiL/synthesia_cracked_apk.pdfIn PDF document text
    • http://juilopkiretlo.ru/ehsaas_tujhe_bhi_song_mr_jatt600pl.pdfIn PDF document text
    • http://sy0n.icu/18489359801lcvwq.pdfIn PDF document text
    • http://verification-help.business/82909506126t6wjs.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/dd593ae8-af1b-4e99-b3a6-69bdb9194602/xirozogoxonuwevegewir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fbdc19-28c7-4f4b-bd51-9610a8ddfc1e/42067287915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8083d8d0-96d1-4e97-a4f1-17c4228394f4/ford_6.4_egr_delete_kit_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddda230-f85b-4fd0-97aa-1136505f3954/56093643687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0163ba8-9d2c-4400-9a10-78bf159c3e7c/soxexor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9beb97a-4821-43c5-860b-7cc851a77153/how_much_do_baristas_make_at_starbucks_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa425d28-d4c4-4468-805d-90854aef134f/nobafivanuxipatowu.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_717c1e78c43745b1aedf111d546f04ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f92f7dd-fe3c-45e6-9a07-d4fafd2b4765/27307714545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd256353-214c-4501-8af8-b680df5baf80/what_is_lateral_thinking_mean.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_f7b6a0d072ec4b73a7943358632c8a54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da6e861-0770-4068-bece-4b3d2a97c1d7/how_to_program_remote_rc122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed29777b-a0dd-454a-bf2d-1dcf87102678/73894039208.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_f613407a785948879b6df0b6705a5249.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2d92dd-4cee-4f81-9bf6-4ee9cff4e7f2/75161191471.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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5004 bytes
SHA-256: 76e8a42cc9c6f9e21d0aad72c0dfb9b2464c4c91da70273d5105cc83b0dbd804
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10196 bytes
SHA-256: 1bdafb41b2b80a1d664288eca9081d3715d2ee5ebd7b708672ff5652e2c29e19