Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dc366b2d310136…

MALICIOUS

PDF

73.6 KB Created: 2021-03-16 05:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1a5e1e19e6bb5a7d99f3936ad8ef8978 SHA-1: 37a95cb34ff1f1fa29c5ba7bce518a5b8c1cc2e7 SHA-256: 52dc366b2d310136a52861a74d481e1b82ad4142c9b0a452fa4692a01204a133
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/123?utm_term=gusto+giorgio+agamben+pdf PDF link annotation
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/5f6a202f4f9.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/ef0eb024e641b.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/gimutitefapube.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/joxomerisupe.pdfIn PDF document text
    • https://zuvigopujipo.weebly.com/uploads/1/3/0/9/130969218/8364374.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/paxafomupufuzoded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_6013154f482cd.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/litafaliz.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/c246b390883.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/6738825.pdfIn PDF document text
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/natavipodeninos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_60045c2fc1224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_601798e7244d8.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/what_to_include_in_a_film_pitch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_5fe9587953fd6.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/rodedu_gukimomar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/casio_triple_sensor_solar_powered_protrek.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/tumasi.pdfIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_398093ab7e0948ed804e4783b307db0c.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_8e47f5ff7e1f42f6a28acc7a76a46211.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/vakenetogukinafus.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_89144a00c5cc4ae1860fca730e831f15.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_537db5192abd465c8bc2e757073a9243.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/54748322162.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/i_love_you_ringtone_wapwon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5500 bytes
SHA-256: 5c469bcf1c24b824037f87659013c563d3e3a8a3b6b69e43a674c700f0c35b4d
font_01_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 12504 bytes
SHA-256: 9788296d00f0ddc48b568932a75013503c5692d18579b40b48b5915eb27c76a7