Malicious PDF — malware analysis report

Static analysis result for SHA-256 886cd20e443b2946…

MALICIOUS

PDF

75.2 KB Created: 2021-06-10 18:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d8d9cae09198ce3bd8f511c8a6c12c2d SHA-1: 3c9fe910b299fc7765715c7539f7e4dcaab249b6 SHA-256: 886cd20e443b2946fd314e161c672d751a5b2e9e5b6f7a841785e1ba7a44b360
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users. The embedded content, though heavily obfuscated, appears to be related to system administration or installation guides, likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/pbw?utm_term=ubuntu+install+stick PDF link annotation
    • https://mozapimijovami.weebly.com/uploads/1/3/4/6/134661863/ruradububew-xaruwolarer-pivug.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/d4c74cd5aa42.pdfIn PDF document text
    • https://xokaxoluxiw.weebly.com/uploads/1/3/5/9/135977396/db78da.pdfIn PDF document text
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/1927091.pdfIn PDF document text
    • https://bexesuriwuba.weebly.com/uploads/1/3/4/4/134464031/2462503.pdfIn PDF document text
    • https://fofodivadi.weebly.com/uploads/1/3/4/8/134895081/zurib_xelulosiw_mitiwu.pdfIn PDF document text
    • https://buregagoli.weebly.com/uploads/1/3/5/3/135304756/7205458.pdfIn PDF document text
    • https://kobafadovuzek.weebly.com/uploads/1/3/4/3/134311208/85a7d73db1f8e.pdfIn PDF document text
    • https://vadekelovade.weebly.com/uploads/1/3/4/3/134372386/wigireduzapirumiboto.pdfIn PDF document text
    • https://mojipodo.weebly.com/uploads/1/3/4/5/134592530/7913451.pdfIn PDF document text
    • https://doxiviju.weebly.com/uploads/1/3/2/3/132302912/9692473.pdfIn PDF document text
    • https://fizakilugoleji.weebly.com/uploads/1/3/1/4/131438405/135bc12504cd469.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/magazekogigidabuzawi.pdfIn PDF document text
    • https://poxopamit.weebly.com/uploads/1/3/4/7/134751622/tawuwanof-jimezotebu-fefivilusupopud-bisanufo.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/zeripiz.pdfIn PDF document text
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/5cf120f4a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8eeb38-74cb-43b8-be69-7c4de3c88819/kujovadidokufilumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5455d5-6528-4fa4-895b-25c868c2c949/the_real_lincoln.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130e55c9-9d18-4da2-b722-02dede5cb6ba/the_son_of_neptune_audiobook_rick_riordan_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08416fa4-1c08-4610-b624-cc0ba333930a/vusizolaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09e9100-7529-49eb-8416-757ae16e1279/ribamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21351fd4-a15a-411d-9959-ac498df45a0e/dijipid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2fc7d1-988c-4c90-b6f2-f59f9a7f2bee/what_reduces_high_blood_pressure_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43615974-991d-4a3c-b22e-f2122ba98c13/50548432423.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 4892 bytes
SHA-256: 988b35453df3417a0d35623efaabb5d5a41c425083d5401c2c83d54669cbf457
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 10452 bytes
SHA-256: 0f637629914a2347ab222223425cec2981cc5a43ffad2e8c4994c8432ee7cad9

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