Malicious PDF — malware analysis report

Static analysis result for SHA-256 4596db8e36845553…

MALICIOUS

PDF

83.8 KB Created: 2021-04-04 06:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b62049e0f53524f27ca721e89bc51697 SHA-1: f4a347e5a4339f64c461225c1a59d50f65864061 SHA-256: 4596db8e36845553c2d013ee72528fb06f82a8d92c03d746ecbc300cd6ef8184
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=english+malayalam+dictionary+pdf+file+download PDF link annotation
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/bugoboposomofosi.pdfIn PDF document text
    • https://pisebozelo.weebly.com/uploads/1/3/4/6/134657423/9252925.pdfIn PDF document text
    • https://mufobaxepomek.weebly.com/uploads/1/3/4/8/134866816/8638761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_600148dd9eab6.pdfIn PDF document text
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/rofuzuxewanus_taful_popisezowawizax_nepewumix.pdfIn PDF document text
    • https://zomogazafef.weebly.com/uploads/1/3/5/3/135348967/jejodegasisebenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5fe0c5a66c575.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/what_type_of_oil_do_you_put_in_a_pressure_washer_pump.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/sinujoka-duponufojetifub-gaxut.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/passione_canzone_napoletana.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/biceps_dumbbell_workout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6020507968755.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/685ea8a6d.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/garipopexa-nanilot-sosonenisurid-ferulowopojeku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0851e4-6797-4ad4-b95a-981031ff3bb2/57_woodworking_plans_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/how_to_use_power_airfryer_pro_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/nolatadotavogabobesalez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c851a4-5ce2-49fe-9f42-5fa08e0275ea/tempstar_furnace_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad1dbde-bb29-49e0-a4ce-ce901db68c26/mozugevobizisimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72710965-aa78-4803-9d9d-b4dc8bc613d1/new_survival_movies_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/dudeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac8abb2-a713-43b4-b2cf-7d3ed397a347/43403287303.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5720 bytes
SHA-256: ac736dcb9f0493f717fcbbeb3e6845817f7cbed0c114f2e43a57ac67ab40206e
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 3808 bytes
SHA-256: c51f051469c4259a1d9fb8664e183054723460c6a97dde26c9ef2f2d26139c91
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 10856 bytes
SHA-256: 7ab6606fcdb9d9886f3521d124cab02cff1075a9daea885a44c312af4553a024
font_03_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 2752 bytes
SHA-256: eff260de515204b09a9ef4db25a41e244ce4353b3dccb5a2a8fc415043b9e3a9

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