Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a11510bf3d60e1f…

MALICIOUS

PDF

80.4 KB Created: 2021-03-08 00:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 894d2396ca56330af8cc7f98310b2e47 SHA-1: 3b945a14b959a76f3015c80a1dbf5fac257063c3 SHA-256: 4a11510bf3d60e1f61d585d23a08e7e7804756a7708ed2f1d1ae12a1a2871842
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://resalured.ru/wix?keyword=white+blood+cell+worksheet+answers PDF link annotation
    • http://datinge.site/roupa_mod_para_minecraft_1.12.2fl97r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_60309cd55e0eb.pdfIn PDF document text
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/madaripoduril-fuvovavi-nenilosobi-xokuwifivamax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fd8cdcb468f5.pdfIn PDF document text
    • https://xisulufi.weebly.com/uploads/1/3/4/8/134870666/jumawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415068/normal_5fe566bcad1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491927/normal_5fdf0e2a607ab.pdfIn PDF document text
    • https://sevipopiwipuf.weebly.com/uploads/1/3/5/3/135302768/milizubalirukat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fc6a849260c6.pdfIn PDF document text
    • http://uscreditinquiry.info/dates_of_the_great_depressiondoexs.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/nigapegipe-baredo-digejapezezirud.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/lamudosatapuf.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/three_major_criticisms_of_differential_association_theory.pdfIn PDF document text
    • http://fitit.space/20068079019fzmeb.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/jigevenupa.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://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_0655dbf18036402ca9729f58144d0f25.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_3a00e2aef72c4b4ca2cf431117e537c0.pdf?index=trueIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_b219ab40966549c89c8b09dcff1fefbe.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_c9d449a964124905b99a646d945a49ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede9f059-fdef-466e-a957-1495b6f866a5/rain_dial_doctor_reviews.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_f4f67c9199f04007a14561bb4856d2e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c661ad5-fc7e-4464-94da-0b751670ea15/xikuzezumu.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/21699077528.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5124 bytes
SHA-256: 52336497c7cd586a4a5969b10da88a2fd2fd871ac66651d6ffb290c2751e93ef
font_01_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 10184 bytes
SHA-256: 0afb3fc5da2c549317e53bcd47580e2c2b035a4fd431087784e2fef4d8d5691c
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e