Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c98b7a4ca39baf…

MALICIOUS

PDF

67.1 KB Created: 2020-11-10 00:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 696f4445c140d185f23c607edfa97280 SHA-1: 9e6b2f3f14e37943496ea151abf15a0021d35f56 SHA-256: d4c98b7a4ca39bafce24d274efabd834ab159c83d317b319ea1fe99d5f59850e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm used for SEO manipulation to direct users to malicious sites. The primary URL observed is https://traffnew.ru/strik?keyword=unblocked+cubefield+hacked, which appears to be a redirector for further malicious activity.

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://traffnew.ru/strik?keyword=unblocked+cubefield+hacked PDF link annotation
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/bisoganu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8c0fd575415.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/6456719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fa01531d3ee7.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/gijeb_gonogumok_ladazo_daxeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fa07e03a78d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5f914628c2e5e.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/293428b.pdfIn PDF document text
    • https://dafanifupo.weebly.com/uploads/1/3/4/6/134645493/dagevepalek_joronogana_xawuxodim_xokuzoliwos.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/65f52e1d8.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/zoxumumusan-xivab-sololeranazat-fupaboludifanil.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/ruvovisiluwak.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/16b5df21a755.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/wovitiku/zigujatowamevaj.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/el_amor_de_la_familia.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/apk_to_windows_10m.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/vaxumexi.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_off0000c90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90C 5032 bytes
SHA-256: 0cbbfdc787339351163db239786fd831f4a58b2305e840bdd49d28b41c50e472
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10852 bytes
SHA-256: 83edacacaec474c2629062b50ec073672a8e471f4439375db9831f79ca97e4a6

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