Malicious PDF — malware analysis report

Static analysis result for SHA-256 59483c7facf723fe…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 13:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e3c8f52382c86a85486d6803e865e409 SHA-1: 3539222ba90179d63bd28a541920b03baa4be322 SHA-256: 59483c7facf723fe27926fe2ea39d847f85eeb0ffbfd91eb2ff6d530f55f7fa3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. One URL, 'https://dafemum.ru/aws?utm_term=chartered+financial+analyst+job+opportunities', is explicitly flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=chartered+financial+analyst+job+opportunities In PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/0249f5471a6.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/tixuxojav-sulutidaruwum-bozubux.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/a7bcbe6c26c.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/0d3f16a.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/nunavafus_bapujaw.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/0915695.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/sanitary_engineering_lecture_notes.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/bojezemujatesanusagedeto.pdfIn PDF document text
    • http://juladolagu.iblogger.org/39566736389.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/fuduwizabegojinisugo.pdfIn PDF document text
    • https://suretazusidik.weebly.com/uploads/1/3/4/0/134012564/jajuzavavifowefa.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/571d59f7-f984-4073-a157-a0b5d8754986/56501418286.pdfIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_88bf3699c5134ba18c3224f9a56581f2.pdf?index=trueIn PDF document text
    • http://pitugozuput.epizy.com/awg_to_mm2_conversion.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_a60b12950286425fa9b46ec060758722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c62662-863a-4e41-8e85-95b277972576/99287933079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995ca72d-60d7-4392-83c8-ceb3fba23e17/the_ancient_secret_of_the_flower_of_life_volume_3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c3e390-ad71-4875-8dea-fa33d0712578/does_bbt_charge_for_wire_transfers.pdfIn PDF document text
    • http://nabeluropezoli.rf.gd/bolsa_familia_brazil.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/algorithm_analysis_and_design_notes.pdfIn PDF document text
    • http://repibikapowa.epizy.com/how_to_compare_and_contrast_in_literature_review.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5464 bytes
SHA-256: aedc6d14c78f51fe3185a373342a68a5bbf1f92c063f944e267a0bd1176d648d
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 11284 bytes
SHA-256: 772a7617968157e4c198c6c11dd5bc576751ca4320deff9e93e2604cd2908b0e

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