Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d9d8d2c8f099a7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 20:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3626cb59af12b3a5757d2b2310aef379 SHA-1: eb22c3633712da3fc4ea82c6616816b721615b88 SHA-256: 36d9d8d2c8f099a746d99eac2a85ef8c1dcaff07b24eb5492cc564b7495b0b43
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to various external PDF documents hosted on disposable domains. The primary lure appears to be "reliability engineering pdf books free download", suggesting a phishing or scam attempt. The presence of numerous external links, many on untrusted domains, indicates a high likelihood of leading users to malicious content or further phishing attempts. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious SEO-based distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=reliability+engineering+pdf+books+free+download PDF link annotation
    • https://mezinetoxapim.weebly.com/uploads/1/3/4/8/134887379/nulasoti.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/276972.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/6111484.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/Adngfri/91482317864.pdfIn PDF document text
    • http://healthit.space/historia_de_espaa_en_la_edad_media_palenzuelapgjjw.pdfIn PDF document text
    • http://all-casino.xyz/52712100672ob23c.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/1586645.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/5105df30c40.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/virginia_woolf_orlando_a_biographyvyqug.pdfIn PDF document text
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/03e2f.pdfIn PDF document text
    • http://milesnires.xyz/51418536039gongn.pdfIn PDF document text
    • http://bionatur.space/microsoft_access_database_engine_20128kubt.pdfIn PDF document text
    • https://mugijimefulex.weebly.com/uploads/1/3/1/6/131606494/4977682.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/sadimofotofujab_lunosowuzorigi.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/wisunaxidutatuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/gdmhfgf/slot_car_derby_mario_party_1.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/6f980a23-9fb9-4b07-95f3-17372a3ad59b/how_to_make_an_android_app_for_beginners_in_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d04fd43-43ab-4bec-be60-e5116c36458f/after_we_fell_book_synopsis.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_aaa192904342455eba162e07ca34cbfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5b8a3c-a600-4e10-9df0-e787aafd229f/zivadezapir.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_dcf93994b87b47098135a0c6335bf141.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a815e6b6-fb90-47d8-bcbf-b82f5832056e/lodimanujodufefolukij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af793c65-da93-42f8-b9bb-12f4f244397a/polk_soundbar_help.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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 5616 bytes
SHA-256: 8c1e75f829235091909d238a4514d7c3c4856598b5b4186cd62ea856e07b1fb7
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 11360 bytes
SHA-256: 2fc9689f5a5b97656c8b5779129217ee6cbb7d8744a2d962761a4ab3575bc2d8