Malicious PDF — malware analysis report

Static analysis result for SHA-256 be421bb627948e33…

MALICIOUS

PDF

78.7 KB Created: 2021-03-14 07:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 29a0b17eaa6345fe3399b6d28cfb9502 SHA-1: f2f4580a652c430306c85b2f9229f26291fd4ea8 SHA-256: be421bb627948e339ac1ac6f34e7071ec0a24fedc9561e792d53794abcc34e22
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The primary purpose appears to be directing users to these external sites, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=bologna+guida+turistica+pdf PDF link annotation
    • http://sungo1.space/pose_running_technique_a_beginners_guide27x7c.pdfIn PDF document text
    • http://lifeshop.pro/serta_adjustable_bed_headboard_kitrqqz9.pdfIn PDF document text
    • http://tophomework.space/joey_gladstone_cut_it_out_memeaq2ek.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/davafevazewidekabuvap.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/45093355245.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/88213123901.pdfIn PDF document text
    • http://miwezewavokalar.iblogger.org/27314674477.pdfIn PDF document text
    • http://russianpatentexpert.com/samirenabidafozajujilebl8uv.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/xawedev.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/af1b34d8-7358-4e1a-9388-40f6e3c70d7a/silence_of_the_lambs_series_chronological_order.pdfIn PDF document text
    • http://pixokux.rf.gd/38219052361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975df28f-ca97-4dae-ae31-96b2101f33f1/poulan_2150_chainsaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c6e970-ef56-40b2-96b1-772f2f25ff13/weguvuxikasenalaxezobotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfef18b2-6f67-40f5-b0e5-9974f9833626/crime_rate_chart_nyc.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_a408fb0327244002a03c3680ace34abc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/624d7fbd-f5b5-4a53-ba67-9b9ecddc8bca/mds_3.0_assessment_schedule.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_1e67d89974e0460c9f6fb895a94835ff.pdf?index=trueIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_d1c8c1fec29643b493ac5ceb78cc1775.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_a4ceda5f28794b07a5120b7519009410.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3490a4f528aa4f68a7e072f262f8a659.pdf?index=trueIn PDF document text
    • http://vibiwarufade.rf.gd/27951633601.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_99de58389c984e49bfcdf98c380653a6.pdf?index=trueIn 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 5372 bytes
SHA-256: 0952766f559fca74c675c0894c599231c0746c22319b07aa5df636e43027b255
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 12672 bytes
SHA-256: 41c23bb627450fb7b6c6fd733b7522c8e42e6062e6571e7c6ecf74783f7a68d5