Malicious PDF — malware analysis report

Static analysis result for SHA-256 df68d4a0d65ea8e2…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 14:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 259be68f60b8d371520666dee6cdb0cc SHA-1: 0aa4dd1a23b9a15660fb8ac71e0a070d95f45045 SHA-256: df68d4a0d65ea8e2c688d6ee1f6a220848c1111204f203033110a75a316576f0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary URL being `https://gimoguvi.ru/wix?keyword=principles+and+prevention+of+corrosion+solution+manual+pdf`. This suggests a phishing or malware distribution attempt by disguising the document as a search result for a technical manual. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/wix?keyword=principles+and+prevention+of+corrosion+solution+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473947/normal_602df2a51c880.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/bomidibino_leziwu.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/5708572.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/1402962.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/6565986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fea356a392ba.pdfIn PDF document text
    • https://ruzudewalaxuge.weebly.com/uploads/1/3/4/4/134497745/f13dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_601695c05dc61.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/95771db5-d8f3-4c3c-b43b-0c1e95447b2a/vebedij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4a6340-466e-4b54-922e-94998ee39096/4813202331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53acdaaf-7c86-4d66-afee-76a015480998/15870127926.pdfIn PDF document text
    • http://vamovatalugoja.epizy.com/axial_scx10_ii_aluminum_parts.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_e5d5264358764871afb4eca1f36fea89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c78601-c5db-4b72-a82d-f384967cf712/15686094659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c3ad74-d552-4a75-a937-6d46c4113908/rijilodiximaxoti.pdfIn PDF document text
    • http://kipixuge.epizy.com/91077103404.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_7483c3a963d0430882765560f3c3ec29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f171fc-9360-4b99-892d-a67e3b97986f/our_global_environment_a_health_perspective_7th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50df0321-e423-4998-867d-092c2fd5048b/wahl_trimmer_comb_sizes.pdfIn PDF document text
    • http://xujogefup.rf.gd/36484519634.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_69af7472043543588070d80cbd176be2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c65763-a5eb-4b4c-be1a-f1751da4f2a7/para_que_sirve_el_zinc_elemental_50_mg.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_cbeb6975a86746d59b84fc02431ebe16.pdf?index=trueIn PDF document text
    • http://badunedotefewep.rf.gd/chicano_rap_oldies_vol_2_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5364 bytes
SHA-256: 1defdf40e90e3c3361146f43441fc39895ef281cc2db9570608a3ea5107bda06
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 11348 bytes
SHA-256: 8a9d491ec062b574f1e96bd4d707fceb2d3d4b79fc85dc67668d15000c72e901

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