Malicious PDF — malware analysis report

Static analysis result for SHA-256 40672b8558f6437d…

MALICIOUS

PDF

80.8 KB Created: 2021-02-20 20:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2b7994c3081ea051e65750b5d064fc01 SHA-1: 7f00121b6ec3a45224a56f5c3a31122a6c0daece SHA-256: 40672b8558f6437d0a80596dded782e7d69b7c5250c02216b6c3f9e05ad60dca
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=deluxe+e-z+bow+maker+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380403/normal_5fddcbc0e4521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_601de4458cbdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fd647a71901b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5feeacaf57eee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408583/normal_60035483668c1.pdfIn PDF document text
    • http://podarokinsta.online/43228412179u9d9h.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/zsgf29S/wufitoxubur.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/6dvzjhp/earth_wind_and_fire_devotion_live_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5fd97046dd528.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/9433405.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/eNNn6jd/lujokafewowafuxatikejelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_602ad0cdc6850.pdfIn PDF document text
    • https://norafolarujasaw.weebly.com/uploads/1/3/1/4/131453206/bokoxibivirusojur.pdfIn PDF document text
    • https://lizekolu.weebly.com/uploads/1/3/1/3/131379949/mibisobogux.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/ditiruz/47231042631.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/avast_antivirus_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/kudasu.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_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 5392 bytes
SHA-256: 06d7fea2e5e5b7ab5c7244d23f64052f69dc21215429bc697d34497d6bb107ad
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 2460 bytes
SHA-256: 643d4dbe57b66c77a8b412d61b04661521d7a471d91a2425ea16b87d842b854f
font_02_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 11328 bytes
SHA-256: aaa608da008568a315c3f0764309ee8ce92093481129d40792ada66c75d6aa95
font_03_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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