Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e377af9d7aab35…

MALICIOUS

PDF

81.5 KB Created: 2021-06-03 10:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4c278ceaafa09f14865f9c34a05457bb SHA-1: 8d328a289f92b98d428a015db7c8abbd1397de7c SHA-256: 84e377af9d7aab35ce7b1986f49df08a8eedb41af42e7b977ec749b3cc609842
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a significant number of external links, indicating it functions as a link farm. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM suggest the document's primary purpose is to direct users to numerous other sites, potentially for SEO manipulation or to host phishing content. While no scripts were directly extracted, the presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://huntic.ru/pbw?utm_term=kevin+murphy+machine+learning+a+probabilistic+perspective+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5fcaa6060fc17.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/wepolejemetof.pdfIn PDF document text
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/3472463.pdfIn PDF document text
    • https://wawuzaxuluzu.weebly.com/uploads/1/3/7/5/137508639/fanuvawi.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/rufuvozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd63b9bc5a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_60006cd0b20fe.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/jerixidakodutuvusuzu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412165/normal_60b388aaf0885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5fc5e87a812f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5fedc2a8e1e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_6026beaa98193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_5fe18b08c2151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_6053653c7fb89.pdfIn PDF document text
    • https://jijukufopu.weebly.com/uploads/1/3/4/7/134735153/bopibikefip-juwopekebebo.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/8562084.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://uploads.strikinglycdn.com/files/c322a383-ec81-45f8-8812-d9ac0e00379b/gramtica_bsica_del_espaol_con_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e85153-918f-4f22-82b2-80e61e1ccc16/rasafilifut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc12a048-142a-4ada-9380-0ec4e82ff018/charlie_and_the_chocolate_factory_1971_main_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86e721b-b8b9-4e80-8fba-c062ecc69651/does_the_jitterbug_smartphone_have_a_sim_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ebbf3a-bbea-4589-83ff-88cf91bcdd79/maxotunimexanazep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8200b6-a45e-409f-b5cb-2ab5745dd27f/77213150769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e4ead8-9470-4e88-8306-d7b9d0996e12/zimufumebiborek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2620b68-6884-4e5d-8a62-3ce0c63ee9ff/16880331769.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 3292 bytes
SHA-256: e8d7b64965f013b6037263fbda773d3c58eb93d84939c26acbfc2e448cbdde84
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 5720 bytes
SHA-256: 97c1a67720b48f41cd4bdf8e4c1ad6e0e2caa99d0fdea921de0b2b2db288e069
font_02_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10952 bytes
SHA-256: 5ddf4979819509a3379f557d7cfaeca71c88d4b962a5ce1fb49766606a801f89
font_03_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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