Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5f351834a026d…

MALICIOUS

PDF

82.5 KB Created: 2021-02-28 09:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 027bdd10bc92bd3c5567a39f65c6c3f5 SHA-1: 0b95145a59f02c3aacca5236f65dfbe78b6e537c SHA-256: 77b5f351834a026d5416fa0665d770adfd71521cafb66ac6bbe05e83a8e8c799
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially used as a lure for spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/aws?utm_term=the+lord+of+the+rings+3+tamil+dubbed+movie+download+in+moviesda PDF link annotation
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/lawifopelavez_koxonokegakijer_mubumu.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/ahbz3wv/3099492813.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/8178043.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/6gjeoic/dakojegubowasanivelek.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/1629693.pdfIn PDF document text
    • https://notomufibaka.weebly.com/uploads/1/3/2/7/132740278/2baa773277e1.pdfIn PDF document text
    • http://kizadunejin.22web.org/begobilizigivudigala.pdfIn PDF document text
    • https://pedadadaroteb.weebly.com/uploads/1/3/0/9/130969242/9131563.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/iqjekji/mineral_fusion_nail_polish_reviews.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/febiritofaxom.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/pghjciQ/4k_dope_wallpapers_for_pc.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/deformierende_spondylose_der_hws.pdfIn PDF document text
    • http://favukimasinete.rf.gd/99613530635.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
stream_004_off0000f443.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF443 13232 bytes
SHA-256: 1cace71467837f387c07df5110d330f42e677159a0412aaf5ab9aec04a849295
font_00_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 5724 bytes
SHA-256: a3609f8c1e9a158798ce26a335582b97ed518bf0ba4bfdc47ee2f75e21a730d4
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 11004 bytes
SHA-256: 349922fa4485b1a1c4efb7ba53931e8c7cc5ab7d2a3f444873c7593a059e1462

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