Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa4071d11a1a8a0…

MALICIOUS

PDF

80.1 KB Created: 2021-06-09 00:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3702204b144d08629c0e2bf03bb31e8 SHA-1: 8a59071926458c6b77e1a31947bdf1d1914d3b89 SHA-256: afa4071d11a1a8a0e00efb150a0e79e94f802b4c64ce0b169b470de2fd3a541a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=transformation+protocol+heat+shock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465719/normal_603f516510aaf.pdfIn PDF document text
    • https://larofumizedewep.weebly.com/uploads/1/3/5/3/135326757/73d9f.pdfIn PDF document text
    • https://javezevefumutew.weebly.com/uploads/1/3/2/7/132740470/8179478.pdfIn PDF document text
    • https://zizujegaduxopur.weebly.com/uploads/1/3/5/9/135972979/dodepukuguve-bupiwexemoref.pdfIn PDF document text
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/2461384.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/perejimozolaj.pdfIn PDF document text
    • https://jelozenodi.weebly.com/uploads/1/3/0/7/130739120/770114.pdfIn PDF document text
    • https://wimetuzozafod.weebly.com/uploads/1/3/4/6/134604259/jepop.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/waxenuz-madizebe.pdfIn PDF document text
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/binimijoxixoz.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4448535/normal_60b7243535892.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/33029527-fb05-49da-99e9-e675ce38f221/my_name_by_sandra_cisneros_excerpted_from_the_house_on_mango_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecac8cd2-5f1d-433c-ac85-b961e49ff006/botawuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742df9f9-d69f-4874-980f-5ead917b8275/26966454924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abbb8da-74a5-4688-98f7-e0b609f592df/maytag_bravos_xl_washer_and_dryer_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be380b5-1ac2-4644-bcd6-3cf89830d177/13177504105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ae7fee-f208-4653-a43c-a60d708d7183/36268636156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3536eac4-b8b8-4d9c-a1d4-02687bfac7e2/23862452700.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 5056 bytes
SHA-256: 99b50cc9470d650929c88cafcc4fd927018850d5a8f58dabf614cf0acdeca98b
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10816 bytes
SHA-256: e775ae116cd4ea9eb5289c736776e3474f83fb38e96176505dc8985e5149cfdd
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 16148 bytes
SHA-256: ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0
font_03_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333