Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f7e5ea47a2fb2a…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 03:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7cb5d452f1a789a590a2430d8fa3376c SHA-1: 573b329eef30fa1a612877da4a36f17a21111d8f SHA-256: 11f7e5ea47a2fb2a8b9f722bcca16add67956a0903dc9dd54b83bfb45ab751ed
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external URIs pointing to various domains, many of which are hosted on disposable platforms like Weebly. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

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://vilenefex.ru/wix?keyword=analysis+without+paralysis+pdf PDF link annotation
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/5011170.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/c0ab86ab8a2a.pdfIn PDF document text
    • https://padaduzarunum.weebly.com/uploads/1/3/1/1/131164270/94ccba164.pdfIn PDF document text
    • https://sadixudodexoz.weebly.com/uploads/1/3/4/2/134234615/6165161.pdfIn PDF document text
    • https://pasobirumolok.weebly.com/uploads/1/3/5/3/135394389/3898690.pdfIn PDF document text
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/rokifisadiwawi_zakokerojinez.pdfIn PDF document text
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/de0da.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/tolupobikojonu.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/a87568.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/sakikivawabulew.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/9f277d2dd8353d.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/vazuxorizuwofigigifo.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/mawitoxupaku.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/3327947.pdfIn PDF document text
    • https://danovijo.weebly.com/uploads/1/3/4/7/134774389/valakulijorokuvud.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/sosotowiredi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_2d3acaf2f35745c6b1431bf47424b808.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_d17fcf26026c4f58a65485735bcb8700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/besame_mucho_piano_notes.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_2c17eecb31224eb4ae60412b62d1d591.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/zokusewevozedupasuke.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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 5312 bytes
SHA-256: e2a8fd8467c45ca0cd181ebfc00ae52c553b7e5014483edf3fe265fbab9e60fe
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10248 bytes
SHA-256: 9f6956d705cf3f980a2ae0d140c49ff82ea82f0a008a159a189bcfb3a7dc6e60