Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a7f750b4721141…

MALICIOUS

PDF

128.3 KB Created: 2021-03-13 21:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f415f059b87f0c108882ddcd579dfdc SHA-1: 18898ee03edcc52b7eef9e0dce134ec26e8689ed SHA-256: 88a7f750b47211410fbf6e6daea62dafd5ee08ec84c042a0a91bbc4fbe8785b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm designed to manipulate search engine results. The primary external URL, https://vilenefex.ru/award?keyword=african+medicinal+plants+pdf, suggests a lure to attract users interested in specific topics. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=african+medicinal+plants+pdf
    • https://cdn-cms.f-static.net/uploads/4502920/normal_603a2c2703493.pdf
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fd81473e28bf.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6031085eeea28.pdf
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5fce922be7c90.pdf
    • https://cdn-cms.f-static.net/uploads/4413109/normal_60350f1c108ab.pdf
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fce9c94177c4.pdf
    • https://static.s123-cdn-static.com/uploads/4449599/normal_5fcf9e618fb65.pdf
    • https://cdn-cms.f-static.net/uploads/4389106/normal_602c2db5722c1.pdf
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fca76b2f1dc0.pdf
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/jawerewukujere.pdf
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fe92c57b4e82.pdf
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/xelefef-gederojamexupu-lalumiro.pdf
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/nejoxuxejikemasivide.pdf
    • https://mosutija.weebly.com/uploads/1/3/4/5/134502389/133074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sagulisopopu.epizy.com/asphalt_8_soundtrack_320kbps.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_1250892050704955ba31c7a2c1147535.pdf?index=true
    • https://uploads.strikinglycdn.com/files/278efadc-b806-467f-b675-4b92d9da128b/what_is_the_origin_of_police_in_america.pdf
    • https://uploads.strikinglycdn.com/files/6472b3c6-2e6d-4710-8ed9-37cfd2ad0fd6/does_usps_return_to_sender.pdf
    • https://uploads.strikinglycdn.com/files/84c173ee-c720-4b71-b046-56bf33beb2df/the_bible_app_free__audio.pdf
    • https://uploads.strikinglycdn.com/files/e5bf41a8-737a-4e21-a765-1a04280651a9/bazumexugemagatomedinoki.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f8cb6e17215b4b2ea4594c3f6ad024fa.pdf?index=true
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_183a808e306d4e20be9bac2edbef27e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/888b50c4-59c2-4951-a33b-e6ef4abf34d6/83894190769.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_18c2cbea57c44f0287712a4a44873657.pdf?index=true
    • http://renaxodemebi.rf.gd/acpi_ven_hpq_dev_0004.pdf
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_d49484ee24324463a559f056df6c463c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b769.bin
919296ea15fb2cea2342ce096d00b58a7d903c5f49cf01b57f0affac9e1d433f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B769 5288 bytes
font_01_sfnt_off0001c953.bin
7f3cc12eac387a9d64ce4f0c082a466220f9f563b9a3e5ad99cf8e24f4029252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C953 11788 bytes

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