Malicious PDF — malware analysis report

Static analysis result for SHA-256 e331a0a9b14b1a53…

MALICIOUS

PDF

81.7 KB Created: 2020-12-18 04:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 09ebbd70657aee7175403f8f8c296d51 SHA-1: eb8bc8fae13b3d12c505cc38632551f3794fea28 SHA-256: e331a0a9b14b1a53275c2b5b2a873c7c09a506e99bdb8122dc3d6c44dafb7e7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary external URI points to 'trafffe.ru', which is highly suspicious and likely serves as a distribution point for malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://trafffe.ru/aws?utm_term=badoo+application+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5faf3f2eae97d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fd05fa0958ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fcb4a46ae9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8a31fd6d802.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/gobiviranubozegur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5fc3ef5a530eb.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/polibogi_koxokeno.pdfIn PDF document text
    • https://xebadaminel.weebly.com/uploads/1/3/4/5/134523447/jabizigune-bifofen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5fdc0851df234.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/34f3d1f9-7530-45d0-8c2f-0bc7f86285df/68951935653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06db678f-f63b-45ba-a5b5-f3ccf7fab777/kelebirozofepuzuvugikubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08c4945-850b-4c61-b9d7-e015716dd791/79424798299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077abe91-ee30-455a-ae78-a7511cb8aee2/dezonofunasusujunodozeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d67a2b-39a5-48ee-8e70-64beab4e051d/70144791864.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 5020 bytes
SHA-256: cf03a6347aaa5bf94a02235b04baea9ffae69d0a223017c1b3f9a6ea7a5fc898
font_02_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 3440 bytes
SHA-256: ddf4d7d89b6c43464df0f154d9f6c6be6e414178aedce2a58c840b642e909690
font_03_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 11100 bytes
SHA-256: e18ee5190918e6f1c486baca50596c6b90320b8652887f7a01284928641b16ee
font_04_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 17424 bytes
SHA-256: 8ee4ae5a0f3b47eaa1a42999e8e1e82981fd324ddc6584c97275638eedadb870

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