Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b3f29b6796f205…

MALICIOUS

PDF

99.2 KB Created: 2021-05-29 08:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0d01e98add7529328356a8e96cd52de9 SHA-1: 7fe59eb5187c07682d69bbb79ffa2adf57e0d37e SHA-256: 38b3f29b6796f205ff158e5e620e0fb926dbe4666d3cf54474054c42e22b7527
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to manipulate search engine results. One prominent URL, 'https://xezojetit.ru/strik?utm_term=anualidades+anticipadas+ejercicios+resueltos+pdf', is presented as a search result for a specific document title, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=anualidades+anticipadas+ejercicios+resueltos+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5ff262a179a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fd8d203928b4.pdfIn PDF document text
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/2092935.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/loxusudukax.pdfIn PDF document text
    • https://jadusozig.weebly.com/uploads/1/3/5/3/135327359/pajavije-vopixevafukire-wejiguliguxuwaf-jogutaje.pdfIn PDF document text
    • https://rexuxoxef.weebly.com/uploads/1/3/4/0/134018301/4849b231c6.pdfIn PDF document text
    • https://linikakisevokeg.weebly.com/uploads/1/3/6/0/136098208/sojozubusase_rakapu_newutonemevepub_tugozixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_6061ddb809c2a.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/6c55948.pdfIn PDF document text
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/1532779.pdfIn PDF document text
    • https://bawosizegidaw.weebly.com/uploads/1/3/1/4/131411147/zitisiruzikizasefo.pdfIn PDF document text
    • https://jinuwipalo.weebly.com/uploads/1/3/5/3/135332432/vakigax-zuwekula-rolar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff89bb824e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_601b12f96fdbf.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/fdc59174-75b9-47fd-b866-404146da5f17/how_to_workout_the_gluteus_medius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d507757-02bc-48d5-8070-9189c28bbb62/41064317696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8df6e8c-50ff-41fa-bf1a-0e6ca5fade0a/q_see_dvr_not_recording.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780fc6a7-f9d3-4bd0-9a0d-41fa4b337a96/bostitch_roofing_nailer_rn45b_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4471e268-7d25-4e80-892c-d669723936ac/american_standard_furnace_parts_list.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 1596 bytes
SHA-256: ca0a280421723b206518063d4fdf2e3afc24c126416f3acfdb523774357dcdd5
font_01_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 5212 bytes
SHA-256: 71ce18746a48d8eae718053b499df0f9f5757549cc51e6879e681b14b689d7aa
font_02_sfnt_off00014c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7C 2472 bytes
SHA-256: a1fcb85f37e0b2a1cbe38c0544e9b77c54107908fcab25311df08494e5cb2d81
font_03_sfnt_off000156b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B7 12232 bytes
SHA-256: 634c25025a9d57bbe8467d4af2c76c502bfce96c6b646c8a85e9209b4489e61c

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