Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca79153082d7ded…

MALICIOUS

PDF

90.7 KB Created: 2021-03-17 11:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa9db19bd08ffb717238177b139f1278 SHA-1: 21af4db6b151df5a0fb64a81f40e900a33fd9439 SHA-256: 6ca79153082d7ded111bb000b42defa3a0929ae6f3f2a365ab12d01b7bfc4a13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially requiring a password to access a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://midufefew.ru/award?keyword=broadlink+rm+mini+3+manual+pdf PDF link annotation
    • http://reduslim-italy.site/football_heads_2014_unblocked_games49s2r.pdfIn PDF document text
    • http://interior.estate/what_do_u_mean_by_mechanical_engineering_designtwanl.pdfIn PDF document text
    • http://blancer.xyz/7949994919qdkg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_60367b444a2f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_60307e6922bd8.pdfIn PDF document text
    • http://activa-fb.com/best_kitchen_scale_for_weight_watchersw8hum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6024a7bc2f684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fdd3e484d1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422879/normal_604e94abd11c8.pdfIn PDF document text
    • http://yourlivehelp.com/59716741549yk3pd.pdfIn PDF document text
    • http://enots.space/waselozivenonozonokezunigp0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fef93c335f08.pdfIn PDF document text
    • http://limecash.xyz/terejowakedogae9217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_60223985341eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/91b17f25-4e07-4837-8936-eed6583cfbf7/26079288993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ee3d52-827d-4c71-8184-a6fbd67896ae/sefito.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_96bee3cd064340219c05a4424ddff713.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c7ca54e76758437eb265a4881027a8bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/599f4dc9-b2cb-4051-9a7a-d1c83d336dbc/18664525689.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_2a5fa4cd7bcf475ab0a37df465666ef7.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_66627c8786fb450c8d3caac15c6e2d56.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 3772 bytes
SHA-256: 5772c55ac9e31b8c2b0f813a2124b75dc6d251a925ba928fa5c1bf0e2d292b9c
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 4972 bytes
SHA-256: 3b35a8fd7e9aeb1420b16e044b338d5030600bbbee780e7552c3c109d8da84d9
font_02_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 11608 bytes
SHA-256: c4b6316b95bf092dd9e71d05384614659dd89d3f616b0449ae4300220ead5dd3
font_03_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 16456 bytes
SHA-256: 20327e2838f36be2dbf08f67a9900ccce15f2b27c957541c2f9716bfe54ba9dc
font_04_sfnt_off00014e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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