Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0dcd7cd2ba53f2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 18:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 80814284c1747d3ce21239a2fe024311 SHA-1: 15ae50bc67a04bb3e73bb30c1d29195214eb37dd SHA-256: ad0dcd7cd2ba53f2252d1af4541042a8286b745da3a7e0e94537ba139fe56f9e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to aquarium filters, which is likely a pretext to disguise the malicious intent of driving traffic to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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/wix?keyword=diatom+filter+for+freshwater+aquarium PDF link annotation
    • https://cdn.sqhk.co/bebubofawa/ghVcvkp/moxetodabosamovadiramikox.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/i1OghPQ/mebobuzipafegezizaguwe.pdfIn PDF document text
    • http://jumpfs.space/calla_lily_flower_delivery5r9yi.pdfIn PDF document text
    • http://nncucuucuc.space/jijemefg03i.pdfIn PDF document text
    • http://noxivivixuza.22web.org/nuromekozutixazegituz.pdfIn PDF document text
    • http://italia-doc.space/microsoft_visio_org_chart_template941ub.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/PJiFha0/asteroid_hitting_earth_movie_scene.pdfIn PDF document text
    • http://letnesil.xyz/xuminotedireterozuwem1uxe.pdfIn PDF document text
    • http://marketes.pro/dufudoritiviwukewittasp2.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/hi75Ohh/disney_princess_dress_up_costume_set.pdfIn PDF document text
    • http://sunny-web.ru/how_long_is_into_the_wild_movie7wsg1.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/WjjHujf/74709625369.pdfIn PDF document text
    • http://lidekuzadapuvi.22web.org/letter_of_introduction_for_job_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/the_employee_credit_union_at_state_university.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_8a5b8599c172452299844e78ae41cf79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/sajaguwonosubefi.pdfIn PDF document text
    • http://sabinozugi.epizy.com/genativedutibexejuj.pdfIn PDF document text
    • http://zevuketeno.rf.gd/zurugopesu.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_20d5f616c7af4939a4827a52d9354c7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/cqc_reports_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/sig_sauer_p938_kydex_iwb_holster.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_b28551143ad04a33acffdd12364c487f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5000 bytes
SHA-256: 3122a6df63b2f9065b912861b409c8f2fac0927a3b127684455c2f1b96ea60f1
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10368 bytes
SHA-256: 1e98179e267d74e61a04b241729d39d4cfec3dc9386f6fea713636b1c8cf2f1a
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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