Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9aae587e77f4bf…

MALICIOUS

PDF

87.8 KB Created: 2021-03-24 10:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a4f744b76ccf14f3ef6336ed2ad2e3b7 SHA-1: e5a3033400093d938b64192dbf24ff0066c28416 SHA-256: bc9aae587e77f4bf525c112fe5bbfc578de555b532522e95e6219a8a240cce1e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://seumenha.ru/wix?keyword=edhelper+exponents+answer+key PDF link annotation
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/27b132bf23.pdfIn PDF document text
    • https://fepagefifumowa.weebly.com/uploads/1/3/2/6/132681901/3032152.pdfIn PDF document text
    • http://babysampler.com/johnson_25_hp_2_stroke_oil_ratioo1xbp.pdfIn PDF document text
    • http://betogav.22web.org/vedotovigol.pdfIn PDF document text
    • http://biomanua.website/madamoguvopowizikjnofj.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/4857941.pdfIn PDF document text
    • http://requiredjokblog.com/the_informer_movie_2019_onlinez37kf.pdfIn PDF document text
    • https://xinozujo.weebly.com/uploads/1/3/0/8/130874257/238b79.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/ce0193e2.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://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_e0ecbee05eb64b9da251ba4820c4a2aa.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_dde61e11ebea46f4aa8bfc018adeb16a.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_3f5d5a2024864f60aad10ee5f404f16f.pdf?index=trueIn PDF document text
    • http://sepuxukejobome.epizy.com/barfi_songs_zip_file.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_fc9493dc18da408b93fa8baad7a4cfa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f70e2a-48e5-4960-a8ae-4aa70f945a7b/chapter_test_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f0e522-5d78-45e3-a0fb-c32c44652ea4/11327197358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd6a7b8-5cdd-4a5d-b9b7-27570569b1f0/vifomoj.pdfIn PDF document text
    • http://dinexun.epizy.com/anonytun_prime_8._8_apk.pdfIn PDF document text
    • http://fixekemira.epizy.com/litaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8cf2c9-e6be-41f9-950a-ca2b5b2890f7/fujatisonopuzuni.pdfIn PDF document text
    • http://zelibigevuloxuj.epizy.com/kidafazinedeko.pdfIn PDF document text
    • http://wemazepiba.epizy.com/78573431154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a4f78d-4cfa-465f-99bd-088991b7100a/fifty_shades_of_grey_full_movie_download_hindi_dubbed_300mb.pdfIn PDF document text
    • http://rurodebijusidof.epizy.com/working_capital_management_project_synopsis.pdfIn PDF document text
    • http://zerason.rf.gd/jivixojexel.pdfIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_e8562a314d6b43f68ee59e21a3cb81ff.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_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 5072 bytes
SHA-256: 3fe95167ae1a47c03a07a73c7f2bdb12efeb63006973c97d639990c9ab3c3aaa
font_01_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 11232 bytes
SHA-256: efa438fa504472849f20587173d42037b2c05b0c57f903de92471237c2ec973a
font_02_sfnt_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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