Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52c6337dace9cc5…

MALICIOUS

PDF

75.8 KB Created: 2021-02-27 07:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd57fc616f6230f70d41e17b5e8af093 SHA-1: 3deb71a7d0abc9caf8b12349445d548d5e182239 SHA-256: c52c6337dace9cc5bf6ded9cfffc2e279c3ff92fb44b891dff2df5a4cf8f7b3b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, characteristic of an SEO link farm. The primary purpose appears to be directing users to potentially malicious websites, as indicated by the embedded URLs and the heuristic 'PDF_SEO_LINK_FARM'. No scripts were extracted, but the presence of numerous external links suggests a redirection mechanism to a second-stage payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=cast+of+legendary PDF link annotation
    • http://samubed.iblogger.org/zafabapog.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/ramuzajiz_dexigam_zokenoto_bowugaje.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/lebotewalesigolu.pdfIn PDF document text
    • http://usacarins.com/sovutawefutezirusv9yv.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/9394924.pdfIn PDF document text
    • http://avbox.org/92610848263n6o3x.pdfIn PDF document text
    • https://fukenavu.weebly.com/uploads/1/3/0/8/130813663/2011653.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/jepufavuvolurovu.pdfIn PDF document text
    • http://simultaneously.space/misegisarudezijerizoiigaw.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/3672175.pdfIn PDF document text
    • http://sberbank.link/how_to_perform_stage_brutalities_mkx1vbgg.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/tp-link_tl-wr702n_quick_setup.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/xonukifo.pdfIn PDF document text
    • http://desokore.medianewsonline.com/30328413146.pdfIn PDF document text
    • https://rupugafes.weebly.com/uploads/1/3/4/8/134847604/3bd48fa433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_to_get_mildew_smell_out_of_lg_washing_machine.pdfIn PDF document text
    • http://gevorewububew.epizy.com/video_animation_software_for_android.pdfIn PDF document text
    • http://waxusumuguk.epizy.com/22522400559.pdfIn PDF document text
    • http://sudamobajo.epizy.com/wivotegefotamanovarani.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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 5080 bytes
SHA-256: b8c38a8b8ce64a6adf93eea5f36d16bf50c8e14742d39a3e6016e8a53e8882d2
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10428 bytes
SHA-256: 93c5f760916d70cf6c71617782ac13f209f5aeece05eb1770574833ad5379d9f

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