Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b6676ab37e3d82…

MALICIOUS

PDF

84.8 KB Created: 2021-05-09 20:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ae4924afaa4dc1f9f6835b711a8dcef SHA-1: b2c755348bd8653ebe88b488eadeb63af1751a9f SHA-256: a7b6676ab37e3d829c4ed7c264c0717bb35e661f5c193eb97720eb0f0f954f38
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=james+and+the+giant+peach+musical+everywhere+that+you+are+lyrics PDF link annotation
    • https://cdn.sqhk.co/veladaxuzeba/WIshd5b/bubble_blast_adventure.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/gafizikiturav-zuxemab.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/4666653.pdfIn PDF document text
    • https://cdn.sqhk.co/vomoxixeri/bjayyvd/jefupumod.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/gd6jcje/konujax.pdfIn PDF document text
    • https://cdn.sqhk.co/zibojaje/dgcIieS/conflict_minerals_reporting_template_cmrt_5._11.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/dowutixoguzap.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/tjhj8aA/kezizuzoxidejizak.pdfIn PDF document text
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/nesoxurixe.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/69542656656.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/jbhc7gc/11427508433.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/ihidCie/77415715162.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/zdjaOU2/vanamikutirusakevedaku.pdfIn PDF document text
    • https://cdn.sqhk.co/givefugonuw/gnphgfo/ravuzulejokesun.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/99e78a1c-9a4e-48e1-b33c-ae6002da18ea/life_cycle_9500hr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d96e8e-06c1-4885-9ebf-79f34688bd3c/what_is_the_most_popular_songs_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090adf4b-a3e6-43fb-ae68-17159122fde1/diary_of_a_wimpy_kid_rodrick_rules_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7443f501-5e3e-4a5c-b215-8a708e56083e/how_to_reset_omron_intellisense_blood_pressure_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e0122d-4d6a-4560-aaa1-8b488aaa5781/maze_runner_4_full_movie_download_in_hindi_480p_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/vmware_vcenter_converter_mac_os_x.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/romufo.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/putuxegatemepime.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_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 5728 bytes
SHA-256: 15f205d8b79f16ae85ede0b5aba8dd0b216518b263d0aa119c05778e65778822
font_01_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 11444 bytes
SHA-256: 54fdbb1c840697e5339d43da6f9e9334181ea831793f6c0c3757498918009d01