Malicious PDF — malware analysis report

Static analysis result for SHA-256 61053e90aebf5924…

MALICIOUS

PDF

77.3 KB Created: 2021-03-18 22:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1a0b68afed221595b9ad0c3e7199cb56 SHA-1: a992a5a8867787656b726c59c28d0a77245291ed SHA-256: 61053e90aebf5924fc45ae7250c7597522b507c314304b2088787addff87f535
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=command+form+imperative+mood+spanish PDF link annotation
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/c3b29fa620b5e.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/runidevufepin_jifimawepisosox_rijofutope_pawonalesenal.pdfIn PDF document text
    • https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/c7ecfe.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/buxudujaxetososewesumibaj.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/c0a385ec32ff.pdfIn PDF document text
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/3240577.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/doxegolip_jujexazotigesi_mijabapo.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/wixujivitesifufepetebonu.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/weziwi.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/lofapujevo.pdfIn PDF document text
    • http://zigodijod.iblogger.org/cbse_class_12_syllabus_2020_19_download.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/nenuxududujezata.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/85d3b927.pdfIn PDF document text
    • https://paseruvuweduzuw.weebly.com/uploads/1/3/1/4/131437476/b74141d2254.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/6789241.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/tapixubunotesedajameka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodedop.rf.gd/tipos_de_anualidades_matematicas_financieras.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_3af8452e4dc442a0b30a02f4074243da.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_5ff3ca026a054310809fe0506a087fea.pdf?index=trueIn PDF document text
    • http://jifisuxevizek.myartsonline.com/1652801275.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_1852d05914b845a4abc6ecb221ce8021.pdf?index=trueIn 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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5216 bytes
SHA-256: d006d9e7b4a1777e1d517290521c6025e6169d3d3ce63383958478b592e709d4
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 11828 bytes
SHA-256: fa09d332b85729f91266b071e8218026e913fbb5ea61dd841b65d5d2adb156e9