Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1e9f4ceb32f0f5…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 23:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e837fb73769942aa5ac2bf2b83bec4d2 SHA-1: 52c16bede15847517b8f129b4349568644ce838f SHA-256: 6b1e9f4ceb32f0f548cbce68420ed533b1e80bcac67bfe37ea8270253f7e087a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://nipisod.ru/award?keyword=artritis+idiopatica+juvenil+pdf. This technique is often used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=artritis+idiopatica+juvenil+pdf
    • https://cdn-cms.f-static.net/uploads/4410211/normal_6010ff7e0b2bc.pdf
    • http://pamuxixa.iblogger.org/53002166005.pdf
    • https://static.s123-cdn-static.com/uploads/4372737/normal_5ffb61d802259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavale/what_does_home_sleep_apnea_test_measure.pdf
    • https://uploads.strikinglycdn.com/files/7f33604d-5083-4fc9-a783-c1745bf5bd8e/lanazijudaroxamulopora.pdf
    • https://s3.amazonaws.com/levovod/debut_shopify_theme_page_template.pdf
    • https://uploads.strikinglycdn.com/files/33d5f25c-2e55-4055-b974-7f45e663a260/joe_turners_come_and_gone_molly_cunningham_monologue.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_309b85926f694289926dacf5dd033d04.pdf?index=true
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_c65dec0076e44f8b819887f8fbe7afbe.pdf?index=true
    • https://s3.amazonaws.com/bokofapig/38110923432.pdf
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_4db65b976f60409baa1dc985efe5e5db.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_4bf3e880c6c640509c341c52ba4ec12b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11c7d4ee-4938-4f91-9ef7-39c640279b64/zakupazofagumit.pdf
    • https://uploads.strikinglycdn.com/files/496217d5-5835-475b-bc47-3064a8f4a555/41143763823.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_8a694a6732d046a386ce8046e0763a06.pdf?index=true
    • https://s3.amazonaws.com/povodijirig/ropinulatogonenunuwe.pdf
    • https://s3.amazonaws.com/tirimofufemukat/cursive_writing_without_tears_worksheets.pdf
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_963359dec17147059d9a2eac963d6396.pdf?index=true
    • http://jajepurexax.rf.gd/pixesed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f721.bin
566505c257977719b8ccab6eb123c0e177075a4315a2708b87c098f01dc325c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 5276 bytes
font_01_sfnt_off00010931.bin
572d69a27128e67755a8caff1507791350cdf5712bdb7ee87fbd8b3fb7c17d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 11532 bytes

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