Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca95714fe0bd52b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 21:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6f9060b970751eead878d848954fbe60 SHA-1: d0c943e48c27cc8b4d97ec13472dc83ee047e54a SHA-256: cca95714fe0bd52bc306ea6462769c08f5d77bddffa91445adb54fea223613dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. The primary URL, 'https://jottigo.ru/award?keyword=basic+electrical+and+electronics+engineering+mcqs+pdf', is presented as a resource for educational materials to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=basic+electrical+and+electronics+engineering+mcqs+pdf PDF link annotation
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/996414.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/4cd20c0f37da308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/gaxufejuguxegenob.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_383aceaa967d4e1a9147ac8ff1636122.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6a014c-2f12-4f7b-8f84-a197f6f7f081/corona_portable_kerosene_heater_model_23-dk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61271d6a-6fa9-488a-aa54-1a4e07edd75d/23883204971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681545ea-988a-4d78-a513-e7f07a124819/manual_camara_canon_powershot_sx710_hs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827e3f37-c70d-4745-9819-d2d9bb6bdaea/lg_440g_unlock_gsmhosting.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_b46cfa9a30fd49d1b8d85826e71497da.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_dacda4f87228428fa24d9a7f2ed970d9.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_9457319ad29f41feb677481fafb6a7a9.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_8811b5ac4e7340cea8963d30cf4489b7.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_3b5905066cbe4a3a8554e53402c9f6f0.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_6ec2a2d3ad9d43ec9b58e458447bbbc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/is_getting_a_w_on_your_transcript_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00bfbdc-4afd-4970-b01b-b38bbaf1127c/how_to_calculate_force_in_magnetic_field.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c90d5a0d6f444f7aa86c442b0633981d.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_3f2934ed8cf44a6db443708a6d9b0a20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/jarikarajexun.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_22d64f0529e746e3921d1ad020cea226.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3623f7-7f75-4855-8488-8d6bceefda1a/xubevatositusoro.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_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 5648 bytes
SHA-256: 3b45a3ea3b607f881a7601f081863893c59ae6373966efbe51fd9f47409290bf
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 11080 bytes
SHA-256: af240a753da650498cc59df2e4e22e56fbd792331cddd3d0f9605396210061c7

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