Malicious PDF — malware analysis report

Static analysis result for SHA-256 28354e904f50f84a…

MALICIOUS

PDF

74.0 KB Created: 2021-03-13 12:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8714ab6549369d373074268755b64961 SHA-1: ef8e4466dea3967b5b59c3fe26c71481c6f19ece SHA-256: 28354e904f50f84a2c084ea3148dc86b84186f72faca71af3b6068d8227a63bd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=so+kieu+truyen+tap+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_6012c8d3eee5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fe17750a5b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5fdbb5f9e6ad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6047ad0b1a75d.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/jorexixapiroso.pdfIn PDF document text
    • https://midunaso.weebly.com/uploads/1/3/4/6/134680252/566a60f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fcd981411fd5.pdfIn PDF document text
    • https://gatudawi.weebly.com/uploads/1/3/1/3/131379110/zetiba.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://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_857ff74150a64426ab69a4290198d60b.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_226df4bdc08d42b38b7ce8abdc151749.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc4b614-201d-4937-a720-f0feab936b6b/2790964353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6529265e-f5a1-4cdf-9b73-7e9246ad954d/the_crown_season_4_cast_diana_grandmother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace0d5f3-6848-430d-940f-aaadd55502a9/maus_art_spiegelman_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91dbd21-c431-4ede-8ad6-7d73509b9d15/which_books_are_in_the_catholic_bible.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_8351e64f4e1e4c3b93e2a1884d5212cb.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_7c05dbfd4fbd42a68f3571581b55f21c.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_bb74711ce9204e018eac7ef82ee8ab7b.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_38fd5553288f44c9add78c8dce04a0fb.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_10112145565646e4b5b3fe362bca1103.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 4884 bytes
SHA-256: 36e19bc6924f41133a86c7405a545f30a5f387d6276dedcddcb72e2930e742bb
font_01_sfnt_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 18616 bytes
SHA-256: 517482a5ab045f5127d371fa08255ef17643e00bfd9bf4ba2e774080ccca4ab7
font_02_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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