Malicious PDF — malware analysis report

Static analysis result for SHA-256 4608cd5888a0cdc4…

MALICIOUS

PDF

126.9 KB Created: 2021-03-16 08:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1972002480094fdaa66b8c42c2b39b3d SHA-1: 608763d97cc882bb6ce25987d5ac08a0c215a11e SHA-256: 4608cd5888a0cdc48ca7c58d0361818cb312c21c4c1e00b2564bb9c2234efd86
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of an external URI pointing to 'bologen.ru' suggests a potential redirection to malicious content or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=download+blossom+blast+saga+unlimited+lives PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481675/normal_6006a9e281571.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/mijabodikejefalugip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fcabab80739b.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/quantitative_chemical_analysis_harris_solutions_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_6005a392ec995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5fff6a1476a13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ffa0098b0002.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/31f4cbc0-57a1-47d6-86df-be1d2a070a45/sodastream_directions_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39d25ac-d100-438a-bba7-d37f62bef886/29952434078.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_a348808fdaa44c0ebfce4baf72b9e0c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/jokolopeloluribefugiloko.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/5708006874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578a6deb-a04a-46f0-9709-b7f3f551cebd/36869853603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1516a940-f293-49d9-9b1a-422ac357ed25/hobbes_de_cive_explication_de_texte.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_691369a36d524d059a0b5853f878dbcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a97159-5e7f-4dc2-a3e0-a14a55b80e44/bukerixudago.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_ae6a5562dd8842d389879a1ec2750538.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3608a684-0bec-46ca-b7b2-f16853dcc746/why_are_prescription_drugs_so_cheap_in_mexico.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_d169746d2a9b4f679ea11a6e0b25ac74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/aplikasi_battery_info_view.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_baec278e070442c0b4635b4ed68492e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc80f0c-902d-4ca5-bf3d-116e79afe297/79748073951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a1537f-1aa0-4419-b8a6-9009c40892d2/my_jaybird_x2_keeps_turning_off.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18623 13880 bytes
SHA-256: c5639ebf7c966d05fa151bb40236e27634e0e4eb369c4d2d4631319f7d9f810b
font_01_sfnt_off0001b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B360 5340 bytes
SHA-256: bed039b86fa310bf42cd1a9deb904b28607c740cb87336708a7b80572ea52f07
font_02_sfnt_off0001c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C598 10980 bytes
SHA-256: be9a4cd6c057b48c4c128765cdde6407e1a37e79ab180848e33b3a0f977bea0c

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