Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d1083835ef0080…

MALICIOUS

PDF

76.6 KB Created: 2021-02-20 10:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77307526a4751e4cb1be1b36335f4768 SHA-1: 04a48113b5db34c41b91b2f0b2d773876b1e2f37 SHA-256: 40d1083835ef0080ffa4647465476bf977c332939804609bad39f1c32e9e5d9a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=dumbbell+routine+pdf PDF link annotation
    • https://cdn.sqhk.co/geroterunetu/f1jfsYR/57146290402.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/hlRHji4/dagaxin.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/biinegg/foroxakepokokipejuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490263/normal_5fca9c72a9e9d.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/j5heUoz/six_guns_gang_showdown_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pepitaji/bjjjaih/37962577544.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/fzhjvY0/56005842090.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/8007776.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/3621116.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/cb41cf13094c2ee.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/e25773857.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/zewaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojedebebetum.epizy.com/cover_letter_canva_template.pdfIn PDF document text
    • http://didewuwu.epizy.com/fishing_guide_jobs_minnesota.pdfIn PDF document text
    • http://pekopun.epizy.com/cumulative_flow_diagram_safe_information.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 4936 bytes
SHA-256: 26cddc24ad7efc4e91d6d390600c9433926916667f3cfe6f2b3b39296244130e
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 10476 bytes
SHA-256: 20fa693cafdf014fb06171e5ceb2f3c0495a09b39457122f3caf9239d1ad13a0

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