Malicious PDF — malware analysis report

Static analysis result for SHA-256 084a45dddb5dba3f…

MALICIOUS

PDF

71.8 KB Created: 2021-06-07 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c8e528a0105e650e17e8282cda6b439 SHA-1: 33b04055abd9666fc39d653847d417220f32399c SHA-256: 084a45dddb5dba3fff0f6741aab7722ce0a3f3a4bdb7971b0625657a2e34943b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious or deceptive websites. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://laborke.ru/pbw?utm_term=example+of+irregular+comparative+and+superlative+forms PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4405925/normal_60afe7dc5baa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393204/normal_5fc987701b9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_6064e245516ad.pdfIn PDF document text
    • https://nibovipuduri.weebly.com/uploads/1/3/0/8/130814681/woverasifob.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/13ea5a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5ffab7b1de881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fee7d3b06fd5.pdfIn PDF document text
    • https://jirigarewur.weebly.com/uploads/1/3/1/6/131606027/576e3ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ffb1bf032c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_602247842919f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fe63c5f1d6e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_6003b25023cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_602b91566f169.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/85ebbf3a-bbea-4589-83ff-88cf91bcdd79/maxotunimexanazep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6789c35-5ba6-4992-b368-2a819918c406/my_samsung_smart_tv_turns_on_but_no_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ea4eb7-f9a8-420f-a867-ab4291d393ab/manual_book_sx_mini_g_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72102987-79a7-471e-abdb-ac4796edf14a/zorananebabotinupax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0127cb60-2396-4182-90bc-93430aa4579f/lobegisotijisimewulokatum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2231c737-e1f4-45b3-be45-e4f2073ea904/46180624871.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 5560 bytes
SHA-256: 6f1017e5c9cfd8f6d0ae0ac893b8b81a0b7d33189013f80f01a237f4af5bb226
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 10420 bytes
SHA-256: 7276395c6de74e12fc6db0a062f566ec1bc715be9c78cd55136f5e354dea2be9

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